center of mass is a point

Explanation

Center of mass (COM): The center of mass (COM) of an object is a hypothetical point where the entire mass of the object is considered to be concentrated. It is not a physical point within the object itself but a theoretical location that simplifies calculations involving the object's motion.Geometric center: While the COM can sometimes coincide with the geometric center of an object (especially for objects with uniform density and symmetrical shapes), it's not always the case. For irregularly shaped or non-uniformly distributed mass objects, the COM can be located anywhere within the object or even outside its physical boundaries.Distance of particles: Option b isn't entirely accurate. While the COM considers the distribution of mass within the object, it's not necessarily the point from which the distances of all particles are equal. The distance of each particle from the COM will vary depending on its individual location within the object.Origin of reference frame: The origin of a reference frame is an arbitrary point chosen to define the coordinate system used to describe the motion of an object. It has no direct connection to the concept of the center of mass