What action should N2 take upon hearing "N1 to the flight deck" during decompression?

When "N1 to the flight deck" is heard during decompression, the correct action is to stow the trolleys and proceed to the flight deck galley. This directive indicates a critical situation that requires N2 to prioritize their own safety and the safety of the passengers. By stowing the trolleys, N2 is ensuring that the cabin is clear of potential obstacles that could impede movement during an emergency, which is vital for both crew efficiency and passenger safety.

Maintaining an organized and clear cabin environment allows for swift access to exits and facilitates emergency procedures. Additionally, heading to the flight deck is necessary as it is where the pilots are managing the situation and may require assistance or provide further instructions to the cabin crew. This action reflects the urgency of responding effectively during decompression, where every second counts.

The other options, while they may seem relevant, do not directly address the immediate needs and protocols of cabin crew during decompression. Therefore, stowing the trolleys and moving to assist in the flight deck is the action that aligns with standard operating procedures in emergency scenarios.