The correct answer is A because a Managing General Agent (MGA) is best understood as an agency or business entity that acts under agreement with insurers, rather than being the insurer itself or simply an individual broker. Ontario's Insurance Act specifically recognizes a "managing general agent" as a separate licensed entity, defined as a corporation or partnership holding an MGA licence under Part XIV.1. That supports the idea that an MGA is an agency-style intermediary operating on behalf of insurer markets, not just a single broker acting alone.
This is why B is not the best answer. While brokers may place business with insurers, an MGA is more than just "a broker contracted to do business on behalf of an insurer." It is a distinct distribution and underwriting channel that can provide access to specialized insurer capacity. C is incorrect because an MGA is not an insurance company; it does not become the insurer simply by arranging or administering business. D is also incorrect because it reverses the relationship. Brokers may work through an MGA, but that does not define what an MGA is.
From a RIBO knowledge perspective, an MGA is commonly treated as a specialized insurance intermediary used where brokers need access to niche products, underwriting expertise, or insurer authority.
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