Final answer:
The responsibility for ensuring an insurance application is completed correctly lies with the applicant, who must provide truthful and comprehensive information for insurance underwriting. Option d.
Step-by-step explanation:
The responsibility of making certain that an application for insurance is filled out completely, correctly, and to the best of his or her knowledge falls on the applicant. The applicant is the individual seeking coverage and is expected to provide accurate and comprehensive information regarding their background, health history, or driving record, which are critical for the insurance company to assess risk and determine appropriate premiums.
Given that insurance functions as a method for individuals to protect against financial loss, the accuracy of the application is crucial to the maintenance of a fair and functional insurance system, where the average person's payments into insurance cover claims, company costs, and allow for profits.