Answer:
The object presented in image 1 is a level. A level is a device designed to indicate whether an object is horizontal or vertical. It consists of a vial filled with a liquid that leaves an air bubble;
the vial slightly curves upwards so that the bubble naturally rests in the middle, the highest point. When the device is slightly inclined, the bubble shifts to the side and away from the marked center.
The tool presented in image 4 is a square, which measures whether an object has a right angle but Isn't able to test whether it is leveled.
The tool presented in image 5 is a C-clamp, which is used for holding objects in place.
The object presented in image 2 is a wrench, which is used for tightening and loosening bolts.
The level is the only device that incorporates a gravity-dependent feature: the air bubble, which changes its position in the tube according to the highest point.
The correct answer is (C).