Answer:
Option C is the answer.
Explanation:
1. A plane can be thought of as flat. This is true as a plane is a flat surface.
2. The surface of a plane is made up of points. It is also true as plane is also defined as a flat surface made up of points.
3. A plane can be seen. It is not true.an never be seen as it is a flat 2-D surface that goes up to infinity.
4. A plane extends infinitely in all directions. It is true.