Answer choices are:
A. It is not possible to make a conclusion using the Law of Detachment because the second statement does not match the conclusion of the given conditional statement.
B. The conclusion is the points M, N, R are coplanar.
C. No conclusion is possible because the hypothesis given is not the same as the hypothesis of the given conditional statement.
D. The conclusion is the points M, N, R form a triangle.
I've never really understood these, and every time there's a question about it on a test or homework I never get it