Explanation
The correct answer is C: Periscope.
A periscope is a device used to see objects that are not in a direct line of sight, especially by submarine personnel. It consists of a long tube with a set of prisms or mirrors inside that allow light to be reflected through an angled path. By adjusting the angle of the mirrors, a person can see objects above the surface of the water without needing to raise the submarine's periscope.
Submarines rely heavily on periscopes for reconnaissance and navigation. When a submarine is submerged, its crew cannot directly see what is happening above the waterline. However, a periscope allows them to view surface vessels, coastline features, and other objects that may be relevant to their mission.
