There are __ common navigation lights that must be displayed from sunset to sunrise and during periods of restricted visibility.such as fog two b three four

The correct answer is b) three.<br /><br />According to the International Regulations for Preventing Collisions at Sea (COLREGs), there are three common navigation lights that must be displayed from sunset to sunrise and during periods of restricted visibility, such as fog:<br /><br />1. **White light**: This is the all-around light that should be visible from all directions. It is typically placed at the top of the mast.<br /><br />2. **Red light**: This light should be visible on the port (left) side of the vessel. It is usually placed on the starboard (right) side of the mast.<br /><br />3. **Green light**: This light should be visible on the starboard (right) side of the vessel. It is typically placed on the port (left) side of the mast.<br /><br />These lights help other vessels identify and determine the position and course of the vessel, ensuring safe navigation.