Explanation
The risk manager should review the agreed-upon risk tolerance to determine the correct limit for continuing construction based on the chance of rain. Risk tolerance is the level of risk an organization is willing to accept and should be established during the risk management planning process.
Risk tolerance is the degree of uncertainty that a stakeholder is willing to accept in respect to a negative outcome on a project objective. Risk tolerance can be expressed as a percentage, a range, a value, or a qualitative statement. Risk tolerance should be agreed upon by the project team and the stakeholders at the beginning of the project, and documented in the risk management plan. The risk manager should review the agreed-upon risk tolerance to find out the correct limit for the rain probability that would affect the construction activity. This would help to resolve the conflicting opinions of the stakeholders and ensure that the risk management decisions are aligned with the project objectives and expectations. Reviewing the agreed-upon risk tolerance is the best option among the choices given, as it is the most relevant and reliable source of information for the risk manager. Performing a sensitivity analysis, finding out the stakeholders' risk appetite, or using industry standard risk thresholds are not as effective or appropriate ways of finding out the correct limit, as they do not reflect the specific agreement and context of the project. References: PMI-RMP Certification Handbook1, page 9; PMBOK Guide, pages 414-415.