Anybody wants to shed some light on the LAWGIC aspect of this question?

Apparently, according to PowerScore explanation, the stimulus is a bi-conditional relationship because of the phrase "if it satisfies two requirements".

Therefore, the bi-conditional relationship is as follows:

Accurately Describes using a few elements AND Make Definite Predictions (---) Good theory.

Would the contrapositive of above become:

/Good theory (---) /Accurately Describes using a few elements OR /Make Definite Predictions?

Admin note: edited title; please use the format of "PT#.S#.Q# - [brief description]"