The correct answer is D) Stud link anchor chain for chafe resistance and strength. Stud link anchor chain is the most effective bridle for a heavy ocean tow due to its superior strength and resistance to chafing. Anchor chain is specifically designed to withstand the high forces and abrasion encountered in maritime towing operations, making it a more suitable choice compared to other materials like polypropylene, nylon, or wire rope. The stud links in the chain help prevent the individual links from grinding against each other, further enhancing the chain's durability and suitability for heavy ocean tows. The other options, while having their own advantages, are not as well-suited for the demanding conditions of a heavy ocean tow. Polypropylene may float but lacks the necessary strength, nylon is strong but more susceptible to chafing, and wire rope, while flexible, does not offer the same level of strength and chafe resistance as stud link anchor chain.