The correct answer is D. prismatic compass.
A prismatic compass is a type of compass that uses a prism to reflect the image of the compass needle onto a scale. This makes it easier to read the compass in bright sunlight or low-light conditions. Agate caps are often fitted with prismatic compasses to provide a more accurate reading of direction.
A cross staff is a navigational instrument that was used to measure the angle between two objects. It consists of two arms that are pivoted at one end and a crosspiece that slides along the arms. The crosspiece is used to sight on two objects, and the angle between the two objects is measured by the position of the crosspiece on the arms.
A level is a tool that is used to measure the horizontal or vertical position of a surface. It consists of a glass tube that is filled with a liquid, such as alcohol or mercury. The liquid in the tube will rise or fall depending on the angle of the surface.
A chain is a length of metal links that is used to measure distance. It is often used in surveying and construction.