What must you say upon boarding a ship when the ensign is flying?

When boarding a ship with the ensign flying, it is customary to use the phrase that signifies respect and adherence to naval protocol. The phrase "I request permission to come aboard" is the appropriate form of greeting. This phrase conveys a formal request to board the vessel and acknowledges the authority of the ship's commanding officer.

Using the correct language is important in naval traditions, as it reflects discipline and respect for the chain of command. The phrase employed here embodies the correct tone and structure expected in such situations. Being concise and formal is key, and this option aligns with those expectations.

The other choices lack the formal structure or the specific phrasing that is traditionally used in these circumstances, making them less suitable for this context.