Which of the following is a factor in determining the insurability of a person?

The applicant's physical health is a vital factor in determining their insurability because it directly influences the risk assessment conducted by the insurance company. Insurers evaluate the applicant's health status, including pre-existing conditions, lifestyle habits (such as smoking or exercise), and overall medical history. This evaluation helps the insurer understand the likelihood of the applicant filing a claim during the policy's term, which is crucial for underwriting decisions. A good health status generally translates to lower premiums and easier approval, while poor health may lead to higher premiums, exclusions, or even denial of coverage.

In contrast, factors like the duration of the insurance policy or the agent's commission structure are more administrative and do not directly affect the individual's risk profile from a health perspective. Additionally, the type of insurance company may influence conditions of the policy or claims process, but it does not assess the insurability based on personal health metrics. Thus, the applicant's physical health is essential for insurers to accurately determine the risk presented by insuring that individual.