The Correct Argument for Using a One-Tailed Test When There

The correct argument for using a one-tailed test when there is a clear basis for predicting a result in a given direction is that

A) the underlying mathematics of one-tailed tests are more accurate.
B) if the result is opposite to the prediction,the researcher can still do a two-tailed test later.
C) it is more conservative in that one-tailed tests make rejecting the null hypothesis harder.
D) it is less conservative in that one-tailed tests make rejecting the null hypothesis easier.