The correct answer is B) shut down the engines and set the sea anchor. If help has not arrived within 10-12 hours after abandoning ship, it is critical to conserve your limited fuel and supplies. Shutting down the engines and setting the sea anchor will help the lifeboat drift more slowly and efficiently, maximizing the time you can remain afloat while awaiting rescue. The other options, such as plotting a course for land or randomly drifting until the fuel runs out, are less likely to lead to a successful rescue and survival. Staying put and conserving resources is the best strategy when awaiting assistance in a lifeboat.