You are correct, the answer C) wait for calmer weather before transferring personnel is the correct answer. The reason for this is that in heavy seas, it is unsafe to attempt to transfer personnel from the survival craft to the rescue vessel. Transferring in heavy seas poses a significant risk of injury or loss of life, as the two vessels could collide or people could fall into the water. The safest course of action is to wait for the weather to calm before attempting the transfer, in order to minimize the dangers. The other options are incorrect because: A) tying up the vessels is unsafe in heavy seas, B) transferring only some personnel could leave others stranded, and D) transferring all personnel immediately is too risky in heavy weather conditions.