In what case are we talking about a material point? a) an ant on a human body b) a student in a class

In what case are we talking about a material point? a) an ant on a human body b) a student in a class c) a car on a road 50 m long

The body can be considered a material point, in which the body’s mass is concentrated, in the case when the movement of the body is many times larger than the size of the body. The shape and size of the body do not play a significant role in the condition of the problem and can be neglected.

Since the size of an ant is many times smaller than the size of a human body, its shape can be neglected, it can be considered a material point.

When a car moves on the road, the shape and size are not of fundamental importance, the car can be considered a material point.

But the size of the student in the class cannot be neglected, they play an important role, it cannot be considered a material point.