What is the purpose of cowls on a vessel?

The purpose of cowls on a vessel is to scoop in air. Cowls are specifically designed to facilitate the ventilation of the engine compartment by directing fresh air into it. This is crucial for maintaining optimal operating temperatures for the engine and preventing overheating. Proper airflow is essential for the efficient functioning of the engine, and cowls play a pivotal role in ensuring that the engine has adequate air supply. This design not only promotes engine efficiency but also contributes to safety by reducing the risk of fire due to overheating.

While there may be other components on a boat that serve to close off compartments, provide storage, or offer structural integrity to the hull, cowls are uniquely designed for airflow purposes, making option B the correct choice in this context.