Which statement is NOT one of the axioms of Euclidean geometry?

A.
Given any two distinct points, there is exactly one line that contains them.
B.
Every plane contains at least three points that do not lie on the same line.
C.
If two points lie in a plane, the line containing these points also lies in the plane.
D.
If two planes intersect, their intersection is a point.

D. If two planes intersect, their intersection is a point. (This is not an axiom of Euclidean geometry, but rather a theorem that can be proven using the axioms.)