You Have Conducted an Investigation Where Differences Were Predicted Between

You have conducted an investigation where differences were predicted between treatments A and B, but none were found. Why is the manipulation check useful in this situation?

A) To determine whether participants could interpret the purpose of the investigation
B) To determine whether the treatments produced no differences or whether the treatments weren't adequately manipulated
C) To determine whether the statistical tests employed were the proper ones to employ
D) To determine whether the dependent variables you assessed were the appropriate dependent variables