According to 46 CFR, the main steering gear must be capable of moving the rudder from 35° on either side to 30° on the other side in not more than how many seconds, at maximum ahead service speed and deepest loadline draft?

Why B is correct

46 CFR §58.25-10(c)(2) specifies that the main steering gear must move the rudder from 35° on either side to 30° on the other in not more than 28 seconds at maximum ahead service speed and deepest loadline draft. The 60-second figure applies to the auxiliary steering gear.