Rules of the Road: BOTH INTERNATIONAL & INLAND Which vessel would exhibit sidelights when underway...

Rule 24

"Scotty Report!" ..."Captain, we are underway, we are pushing ahead, but we're not making way!! I dont know how much more she can take!"

Tricky. Reverse of what you'd think; "Which one doesn't need sidelights when not underway". This question is, "what vessels don't need sidelights when on the water, but not going anywhere. B,C & D 'turn off' their running lights when 'on the water' but not going anywhere.

Memory Aid (NDFT) "Never Dare Forget This" Not Under Command - Dredge - Fishing - Trawl ( all are not required to have sidelights when not making way...

Captain, we lost the English majors to write the questions, I don’t know how more she can take!

Captain, we lost our English majors to write the questions. I don’t know how much more
She can take!

I have this exact question on my renewal examination-and the correct answer as given here (a vessel pushing ahead) is not one of the options.