The correct answer is C. The ability of an insurer to meet its financial obligations. Insurer solvency is a fundamental concept in insurance because an insurance promise only has value if the insurer is financially able to pay covered claims when they become due. Solvency means the insurer has sufficient assets, capital, reserves, liquidity, and financial strength to meet policyholder obligations. For brokers, solvency is relevant when selecting markets, especially for large commercial accounts, long-tail liability risks, specialty placements, and high-limit programs. A financially unstable insurer may offer attractive premiums, but that does not help the client if the insurer cannot respond when a major loss occurs. Option A describes a form of participation or insurance arrangement, not solvency. Option B is incorrect because rating agencies provide opinions about financial strength, but solvency itself is not merely an obligation to satisfy a rating. Option D refers to claims activity, not financial ability. Brokers must consider insurer strength, reputation, licensing, claims-paying record, and market stability when recommending coverage. Course topic reference: Introduction to Commercial Insurance; Insurer Solvency; Market Selection; Financial Strength and Claims-Paying Ability.

===============