Rules of the Road: BOTH INTERNATIONAL & INLAND What shall a partly submerged vessel or object being...

Exactly. Or the length of the tow.

when do you think day shapes should go up

There is only one shape that a party submerged object can show in accordance with Rule 24(g)(iv) therefore you know the only answer is (D). The only lights are listed in 24(g)(i)(ii)(iii), but are not listed as options.