The correct answer is: C. Level
A level is a tool used to measure the vertical or horizontal position of a surface. It is used in construction to ensure that surfaces are level, and in surveying to measure the elevation of points on the Earth’s surface.
A magnetic compass is a device used to find
direction. It consists of a magnetized needle that aligns itself with the Earth’s magnetic field. The needle points north, which can be used to find direction.A theodolite is an instrument used to measure angles in the horizontal and vertical planes. It is used in surveying and engineering to measure the angles between objects.
A clinometer is an instrument used to measure angles of slope. It is used in surveying and engineering to measure the slope of surfaces.
In the context of laying sewers, a level is used to ensure that the sewer is laid at a consistent depth. This is important to ensure that the sewer is properly drained and does not leak.