Contra proferentem is a rule of contractual interpretation under which ambiguity is interpreted against the party that drafted the wording. In insurance, the insurer normally drafts the policy wording, so unclear or ambiguous language is generally construed in favour of the insured. This does not mean courts rewrite the policy or ignore clear exclusions; the rule applies when wording is genuinely uncertain after ordinary interpretation methods are used. Option A describes voiding or treating a contract as nonexistent, which is not contra proferentem. Option B relates more to affirming or avoiding a contract in certain legal contexts, not ambiguity. Option D concerns compliance obligations of insureds, not interpretive ambiguity. For brokers and agents, the concept matters because wording clarity is central to coverage advice. A policy may appear to provide coverage, but exclusions, definitions, limits, and conditions can narrow the result. Intermediaries should not rely on ambiguity as a coverage strategy; they should select clear wording and explain limitations before loss. References/topics: Property Insurance-Wordings; policy interpretation, ambiguity, contra proferentem, insurer-drafted wording.