Under California Insurance Code Section 380, the "policy" is defined as:

Why B is correct

Section 380 states: "The written instrument, in which a contract of insurance is set forth, is the policy." This makes the policy the formal written embodiment of the insurance contract. The application may be attached to and made part of the policy by reference, but it is the policy document itself that defines the terms, conditions, and coverages of the contract. Because California requires the insurance contract to be in writing, no oral agreement can serve as the policy.

Why the other options are wrong

• A) An insurance contract must be in writing in California; no oral agreement constitutes the policy.
• C) The application supplies representations and information; it becomes part of the contract but is not itself the policy.
• D) A certificate of authority is the Commissioner's authorization for the insurer to do business, not the policy.

Memory hook

Policy = the written paper that holds the contract. No paper, no policy — no oral insurance in California.

Why B is correct

Section 380 defines the policy as the written instrument in which the contract of insurance is set forth. The policy is the written embodiment of the agreement between the insurer and the insured, and it contains the terms of coverage. The application is typically attached to and made part of the policy under the entire-contract rule, but the application itself is not the policy. An oral promise of coverage does not satisfy the requirement of a written instrument, and an insurer's certificate of authority is a licensing document issued by the Commissioner rather than a contract of insurance.

Why the other options are wrong

• D) Section 380 requires a written instrument in which the contract is set forth. An oral promise of coverage does not satisfy the statutory definition of a policy. This common misconception is exactly what the governing rule rejects, so the option is incorrect.
• A) The application is the applicant's request for coverage and a source of statements. Once attached it becomes part of the contract, but it is not the policy itself. This contradicts the governing rule explained above and therefore cannot be the correct answer.
• C) A certificate of authority is the document authorizing an insurer to transact insurance in California. It is a licensing document, not the contract of insurance. The controlling legal standard set out above demonstrates precisely why this option is incorrect.

Memory hook

The policy is the paper the contract lives in. Application asks for it; certificate licenses it; policy writes it.