Under the Inland Navigation Rules, which of the following vessels is NOT listed in Rule 18 as a vessel that a power-driven vessel underway must keep out of the way of?

Why C is correct

33 CFR §83.18(a) lists four vessel types that a power-driven vessel must keep out of the way of: vessel not under command, vessel restricted in her ability to maneuver, vessel engaged in fishing, and sailing vessel. 'Vessel constrained by her draft' is a category found in the International Regulations (COLREGs) but does not appear in Inland Rule 18.