Question 339Navigation General

The correct answer is A) at no time. The dumping of refuse in a lock is not permitted under any circumstances. This is regulated by the U.S. Coast Guard and other maritime authorities, which strictly prohibit the discharge of any waste or refuse into locks or other navigable waterways. Options B, C, and D are incorrect because they suggest there are situations where dumping refuse in a lock is allowed, which is not the case. The proper disposal of waste is required to maintain the cleanliness and safety of these critical maritime infrastructure.