The correct answer is B) nylon line has more strength than manila line, size for size. Nylon is a synthetic fiber that is generally stronger and more durable than natural fibers like manila. Nylon has a higher tensile strength, which means it can withstand more force before breaking compared to manila line of the same diameter. This makes nylon a preferred choice for many marine applications where strength and reliability are important. The other answer choices are incorrect because A) nylon is actually stronger than manila, C) nylon is not equivalent but rather stronger, and D) nylon does not rot quicker than manila, in fact it is more resistant to rot and weathering.