Which organization focuses on the interests of brokers in the London insurance market?

The correct choice is C, as BIBA (British Insurance Brokers' Association) is specifically dedicated to representing and advocating for the interests of insurance brokers in the United Kingdom, including those operating within the London insurance market. BIBA plays a crucial role in providing support, resources, and guidance to brokers, ensuring they can effectively navigate the complexities of insurance practices and regulations.

BIBA's focus is on enhancing the operational environment for brokers, promoting best practices, and influencing policy and regulatory matters that affect the brokerage community. By aligning their activities with the needs and challenges faced by brokers, BIBA ensures that their members are equipped to provide the best service possible.

In contrast, the other organizations listed do serve important functions within the insurance industry but their primary focus is not specifically on brokers. For instance, the International Underwriting Association represents underwriting interests, whereas the Lloyd's Market Association primarily connects and supports members within the Lloyd's market. The Managing General Agents Association is specifically aimed at the interests of managing general agents rather than brokers as a whole.