The correct answer is C) All personnel on the disabled vessel don to life jackets. Once you have agreed to assist a disabled vessel, the primary responsibility is to ensure the safety of all personnel on the disabled vessel. Requiring all crew and passengers to don life jackets is a critical safety precaution in case the towing operation goes awry or the disabled vessel becomes unstable. This is a standard procedure outlined in Coast Guard regulations to protect lives during marine assist operations. The other options are incorrect because they do not address the fundamental need to secure the safety of the people on the disabled vessel first. Positioning people on the highest point, dumping fuel/ballast, or having just the operator on the bow are not the priority in this situation - the top priority is ensuring everyone is wearing a life jacket.