Final answer:
Cynthia had an insurable interest in Brian's life as they were friends, so she will be entitled to the insurance proceeds upon his death.
Step-by-step explanation:
Based on the scenario provided, Cynthia had an insurable interest in Brian's life since they were friends. Insurable interest refers to a legal principle that states an individual must have a financial interest in the life or well-being of another person in order to purchase a life insurance policy on their life. In this case, Cynthia purchased a life insurance policy on Brian's life and would be entitled to the insurance proceeds upon his death.