During which watch are the heads cleaned and butt cans emptied?

Correct Answer: Option C — 0000-0400

The 0000-0400 watch, often referred to as the 'mid-watch,' is designated for deep cleaning and maintenance tasks that would disrupt daytime operations. Cleaning heads and emptying butt cans during these hours ensures sanitary conditions are maintained for the crew without interfering with the high-traffic periods of the day.