Step 1: Understanding Naval Ceremonies:
Naval traditions dictate precise ceremonies for the hoisting and lowering of flags on commissioned warships and shore establishments to demonstrate discipline and national pride.
Step 2: Evaluating the Ceremonial Options:
• Colours (A): This is the morning ceremony where the National Flag and Naval Ensign are officially hoisted (usually at $0800\text{ hours}$).
• Dressing Ship (B): A festive tradition where a ship is decorated with international code flags along its mastheads during national holidays or special occasions.
• Piping the Side (D): A traditional boatswain's pipe call used to welcome a high-ranking officer or dignitary aboard the ship.
• Sunset (C): This is the formal evening ceremony conducted at sunset. During this solemn ceremony, a bugle is sounded, the guard presents arms, and the National Flag and Naval Ensign are respectfully lowered for the night.
Step 3: Selecting the Correct Answer:
Since the question specifically asks for the lowering ceremony, option (C) is the correct answer.