General State University Recently Decided to Discontinue Its Use of the GRE

General State University recently decided to discontinue its use of the GRE as an admissions tool for its graduate programs because they observed no correlation between GRE scores and subsequent GPAs.Ninety percent of the grades awarded in the graduate programs at General State University are A's.What General State has failed to consider in this situation is the issue of

A) curvilinear relationships.
B) causality.
C) the third variable problem.
D) restrictive range.