46 CFR Subchapter T applies to a vessel of less than 100 gross tons that carries more than six passengers, including at least one for hire, provided the vessel carries how many passengers or fewer?

Why B is correct

46 CFR §175.110(a) states that Subchapter T applies to each vessel of less than 100 gross tons that carries 150 or fewer passengers (or has overnight accommodations for 49 or fewer passengers). Vessels carrying more than 150 passengers fall under Subchapter K.