Germaine Applied for an Opening at Rotary Propulsion Systems (RPS)in

Germaine applied for an opening at Rotary Propulsion Systems (RPS) in May and took the company's aptitude test for entry-level management jobs.RPS did not call Germaine back for a second interview until September,and at that time,Germaine took the aptitude test again.Germaine's scores on the test were significantly different in May than in September.This is an indication that the test may not be

A) valid.
B) predictable.
C) reliable.
D) statistically significant.