The two all-round lights of a pilot vessel of less than 20 meters in length carried in a vertical line must have their lowest light placed at a minimum height above the gunwale of:

Why A is correct

33 CFR §84.02(i)(ii) states that on a vessel of less than 20 meters in length, lights carried in a vertical line shall be spaced not less than 1 meter apart and the lowest shall be placed at a height of not less than 2 meters above the gunwale.