The correct answer is B) activate the unit and take it with you to the closest survival craft. When the order to abandon ship is given, the EPIRB (Emergency Position Indicating Radio Beacon) should be activated and brought with you to the survival craft. This ensures the EPIRB can continue to transmit the vessel's distress signal and location, aiding search and rescue efforts even after the ship has been abandoned. The other options are incorrect - option A is incorrect because the EPIRB should not be left behind on the vessel, option C is incorrect because action is required with the EPIRB, and option D is incorrect because the EPIRB needs to be manually activated in an emergency situation.