Final answer:
The abbreviation "c.s." or "x.s." means Cross section, which is used in physics and engineering to describe the area that would be visible if an object was cut on a plane. This term also relates to centripetal force, which is always center-seeking.
Step-by-step explanation:
The abbreviation "c.s." or "x.s." represents B) Cross section. In the context of physics and engineering, a cross section refers to an area that can be exposed when an object is cut through by a plane. For instance, the surface of a cut made through an object, such as a piece of pipe, can show its inner structure and dimensions. In the information provided, the term cross section is used to describe the cut view of an object for analysis, which can be related to its structural integrity or flow characteristics when subject to certain forces, like the centripetal force.
Centripetal force always points towards the center of curvature, which corresponds to option a. center-seeking in the provided text. This is essential for understanding circular motion in physics, particularly when analyzing the motion of an object following a curved path, such as a car on a racetrack or a particle in a centrifuge.