This is a tough choice. If the ship sinks or if the crew abandons the ship, the sailors might only survive for a few minutes in the icy North Atlantic. However, if you go to rescue the crew you cannot defend the convoy against further attackers, and you become a sitting duck as you slow down to retrieve the men in the water. This is why convoy commanders designated one ship as the rescue ship. This ship did the dangerous job of trying to aid stricken ships, while the rest of the escort continued their duties. Your best response is "B" to hold your position until otherwise ordered but go to action stations to get your guns and depth charges ready for a possible attack on the U-Boat