According to 33 CFR §151.51, the MARPOL Annex V garbage placard requirement applies to manned U.S. vessels of what minimum length?

Why C is correct

33 CFR §151.51(e)(1) specifies that the placard requirement under §151.59 applies to a manned U.S. ship (other than a fixed or floating drilling rig or other platform) that is 26 feet or more in length.