Answer:
A. Line
Explanation:
This is called a line. Imagine that there are two pieces of paper. Each of these are a plane. Imagine, now, one of the points on the plane, any two point are also on the plane, this is a straight line. Therefore, a straight line lies on the plane. The is the property of a "flatness" that is associated with a plane. Now if there are two papers, that for some reason are able to intersect each other, two distinct lines intersect. Imagination is key to resolve the simplicity and complexity of this problem. Application of mathematics to define the meaning of points and lines will give the tools needed to find the deeper meaning of this problem.
