Final answer:
A sailboat at night will display red and green sidelights as well as a white masthead light to aid in navigation and prevent collisions. so, option 1 is tyhe correct answer.
Step-by-step explanation:
When sailing at night, a sailboat under power by sails alone will display red and green lights to indicate their port (red) and starboard (green) sides, as well as a white light at the masthead to indicate its presence. This is to ensure that other vessels can determine the direction the sailboat is traveling and who has the right of way. These lights serve as important navigational aids to prevent collisions and are a requirement under maritime regulations.
One of the combinations of lights that a sailboat displays when sailing at night is red and green lights. The red light is displayed on the port (left) side of the boat, while the green light is displayed on the starboard (right) side of the boat. These lights help other boaters determine the direction in which the boat is moving and avoid collisions.