What color are the sidelights for a power-driven vessel?

The sidelights for a power-driven vessel are red and green. These lights are essential for navigation and safety at night or during periods of reduced visibility. The red light is placed on the port (left) side of the vessel, while the green light is positioned on the starboard (right) side. This configuration helps other vessels determine the direction a power-driven vessel is heading. For example, if a mariner sees the red light, they know they are approaching the vessel from its starboard side, and if they see the green light, they are coming up on its port side. This arrangement aligns with the international regulations for preventing collisions at sea, providing a clear visual indication of the vessel's orientation and movement to other navigators.

The other options do not conform to the established maritime standards for navigation lights, which is why they would not be the correct answer.