The correct answer is A. Liability insurance policies impose an assistance and cooperation condition on the insured. Under the traditional policy wording, the insured must cooperate with the insurer and, when requested, assist in the conduct of suits and in enforcing rights of contribution or indemnity against persons or organizations that may be liable to the insured for the covered injury or damage. Courts reproducing standard liability-policy language confirm this contractual obligation.

Option B conflicts with another fundamental liability-policy condition: an insured generally may not voluntarily make payments, assume obligations, or incur expenses without the insurer's consent, except for specifically permitted expenses such as immediate first aid under applicable forms. Unauthorized voluntary payments can prejudice the insurer's contractual control of the claim.

Option C is imprecise. Although an insured can be required to assist the insurer in making settlements, the insurer normally controls settlement negotiations within the authority granted by the liability contract. The question asks for the specific duty expressed in standard cooperation language, making A the precise choice. Paying legal bills, option D, is likewise not the insured's cooperation obligation where covered defense costs are contractually borne by the insurer.

The Series 17-70 outline expressly includes duties after loss, subrogation, third-party provisions, settlement procedures, and subrogation procedures.