If your spending power is great, you are happy.

Mehran August 8, 2016

@willettc the correct answer here is the contrapositive of the principle.

You are correct that "if" introduces a sufficient condition, so we would diagram the principle as follows:

SPG ==> H

But every principle has a contrapositive that is identical in meaning.

The contrapositive is far more likely to be tested on the LSAT, since it is one additional step for students.

The contrapositive is created by reversing AND negating the principle, so the contrapositive here would be:

not H ==> not SPG

This is exactly what (A) says, so (A) is the correct answer.

Hope this helps!

For a more in-depth discussion of these concepts, please watch our video lesson on Sufficient & Necessary conditions.