Which of the following is the primary source of information that an insurer uses to evaluate an insured's risk for life insurance?

The primary source of information that an insurer uses to evaluate an insured's risk for life insurance is the insurance application. This document contains essential information about the applicant's health, lifestyle, and personal details, which are critical in assessing the risk level associated with providing life insurance coverage. The insurance application typically asks specific questions regarding the individual's medical history, occupation, hobbies, and family health history.

While medical records, credit history, and an agent's report can provide additional insights into the applicant's risk profile, they are considered secondary sources. Medical records may offer details about pre-existing health conditions, but they usually require the applicant's consent to access. Credit history can provide information regarding financial responsibility, which may be relevant for some insurers but does not directly address health risk. The agent's report may contain observations made by the agent during their interactions with the applicant, but it is ultimately an interpretation of the information from the applicant rather than the foundational data itself.

In summary, the insurance application stands out as the most direct and comprehensive source of information that insurers rely on when evaluating life insurance applications, making it the correct choice in this context.