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What color light is placed on the port side of a vessel?

  1. Red

  2. Green

  3. White

  4. Yellow

The correct answer is: Red

The correct color light placed on the port side of a vessel is red. This choice is based on the International Regulations for Preventing Collisions at Sea (COLREGS), which state that a red light must be displayed on the port (left) side of a vessel. This is to indicate that the vessel is approaching oncoming traffic, as the red light will be visible to other vessels on the port side. The other choices are incorrect because green (B) is placed on the starboard (right) side of the vessel, white (C) is used for navigation and signaling purposes, and yellow (D) is typically used for special warning signals.