Why use a twotailed test even if there is a clear basis for

Why use a two-tailed test even if there is a clear basis for predicting a result in a given direction?

Solution

The correct argument for using a two-tailed test, even if there is a clear basis for predicting a result in a given direction, is that
A) if the null hypothesis is in fact true, rejecting it will provide stronger evidence in support of it.
B) one-tailed tests cannot be used in most studies involving one or two groups.
C) if an unexpected result that is opposite of what is predicted occurs, it does not have to be ignored---------answer.
D) a two-tailed test improves the chance of getting a statistically significant result