When Employing a Small Sample Mann-Whitney U Test for a Two-Tailed

Multiple Choice

When employing a small sample Mann-Whitney U test for a two-tailed test, which of the following is true?

A) The sample sizes need to be equal.
B) Select as the test statistic the smaller of the two U values.
C) Select either of the U values to be the test statistic.
D) The alpha level should be doubled.