The opening of a mechanical lock without the proper key by carefully aligning the pins in the lock is defined as lock picking. A mechanical lock is a device that secures an entry point, such as a door, a window, or a cabinet, by using a physical mechanism, such as a pin tumbler, a wafer, or a disc detainer. A mechanical lock requires a proper key to unlock it, which matches the configuration of the mechanism. Lock picking is a technique of manipulating the mechanism of the lock without the proper key, usually by using tools, such as picks, tension wrenches, or rakes.
Lock picking can exploit the flaws or weaknesses of the lock, such as the variations, tolerances, or defects of the pins or the cylinder. Lock picking can be used for legitimate purposes, such as locksmithing, hobby, or sport, or for illegitimate purposes, such as burglary, espionage, or sabotage.

The correct answer is C.
Paper is described as a common combustible and is therefore rated a class A fire. An electrical fire is rated Class C.
Gas is not defined as a combustible.

This question is testing your ability to evaluate whether items on the list are Qualitative or Quantitative. All of the items listed were Qualitative except Lost of Revenue which is Quantitative.
Those are mainly two approaches to risk analysis, see a description of each below:
A quantitative risk analysis is used to assign monetary and numeric values to all elements of the risk analysis process. Each element within the analysis (asset value, threat frequency, severity of vulnerability, impact damage, safeguard costs, safeguard effectiveness, uncertainty, and probability items) is quantified and entered into equations to determine total and residual risks. It is more of a scientific or mathematical approach to risk analysis compared to qualitative.
A qualitative risk analysis uses a "softer" approach to the data elements of a risk analysis . It does not quantify that data, which means that it does not assign numeric values to the data so that they can be used in equations.
Qualitative and quantitative impact information should be gathered and then properly analyzed and interpreted. The goal is to see exactly how a business will be affected by different threats.
The effects can be economical, operational, or both. Upon completion of the data analysis, it should be reviewed with the most knowledgeable people within the company to ensure that the findings are appropriate and that it describes the real risks and impacts the organization faces. This will help flush out any additional data points not originally obtained and will give a fuller understanding of all the possible business impacts.
Loss criteria must be applied to the individual threats that were identified. The criteria may include the following:
Loss in reputation and public confidence
Loss of competitive advantages
Increase in operational expenses
Violations of contract agreements
Violations of legal and regulatory requirements
Delayed income costs
Loss in revenue
Loss in productivity
Reference used for this question:
Harris, Shon (2012-10-18). CISSP All-in-One Exam Guide, 6th Edition (p. 909). McGraw-Hill.
Kindle Edition.

This is what the static's says. Most of the downtime is cause of unexpected hardware failure. Commonly you just replace the FRU (Field replazable unit) when they fail.
Usually a well written software does not fail if the hardware is running correctly. The human errors are controllable and natural disasters are not very often. Hardware failure is very common, it's a good practice to have spare disks, NIC and any other hardware FRU's in your company to minimize the downtime with quick replacements.