Who makes the appropriate 1MC calls during a Man Overboard after muster?

The correct choice for making the appropriate 1MC calls during a Man Overboard situation following muster is the Petty Officer of the Watch. This individual is responsible for maintaining the watch and managing the immediate response actions, including communication protocols, during critical incidents such as a man overboard.

The duty of the Petty Officer of the Watch is to ensure that immediate notifications and commands are relayed effectively and efficiently over the ship's intercom system (1MC). This is crucial to the safety of the overboard individual and to mobilize the crew for an effective rescue response.

While the Ship's Captain has overall authority and may issue orders during an emergency, it is the Petty Officer of the Watch who typically handles the operational communications directly. The Chief Petty Officer and the Executive Officer play important roles in the command structure but are not the ones primarily tasked with making these emergency 1MC calls. Their focus would be on broader leadership and coordination aspects during such incidents.