The correct answer is B) protected from the weather. The electrical wiring on all "T-Boats" (vessels carrying more than 6 passengers for hire) must be protected from the weather to ensure safe and reliable operation. This is a requirement outlined in the regulations governing the construction and equipment of small passenger vessels, as electrical systems can be vulnerable to damage from exposure to the elements. The other options are incorrect because they do not fully address the need to protect the wiring from the weather, which is the primary concern for electrical systems on these types of vessels.