The primary reason for an internal auditor to use a risk and control questionnaire when auditing financial processes is to gain an understanding of the control environment. These questionnaires help auditors identify and evaluate the presence and effectiveness of controls within the financial processes. They provide a structured way to gather information about the control environment, helping auditors understand the organization's risk management and control practices before conducting detailed testing.
Reference:
IIA Standards: 2201 - Planning Considerations
IIA Practice Guide: Internal Auditing and Fraud

According to IIA guidance, curiosity is a key attribute that indicates a candidate's ability to probe further when reviewing incidents that have the appearance of misbehavior. Curiosity drives the auditor to ask deeper questions, seek out underlying causes, and thoroughly investigate anomalies. While integrity (Option A), flexibility (Option B), and initiative (Option C) are important qualities for an internal auditor, curiosity specifically relates to the propensity to investigate and uncover the truth behind incidents.References:
* IIA Standard 1200: Proficiency and Due Professional Care.
* IIA Practice Guide on Competency Framework for Internal Auditing.