The correct answer is C) in a sealed locker with adequate air circulation. The reasoning behind this is that towing hawsers are typically made of natural or synthetic fibers that can be damaged by exposure to direct sunlight, heat, and moisture. Storing the hawser in a sealed locker with adequate air circulation helps protect it from these environmental factors, preserving its strength and integrity. This storage method is in line with best practices and regulations for the proper handling and maintenance of towing equipment on commercial vessels. The other options are incorrect because: A) Storing the hawser in the engine room exposes it to excessive heat and vibration, which can compromise the material. B) Faking the hawser on a rack may not provide the necessary protection from the elements. D) Spooling the hawser on the winch can lead to kinking and potential damage to the fibers.