In Order to Measure the Reliability of a Test, an Investigator

In order to measure the reliability of a test, an investigator determines

A) whether the test is equally fair to all the people who take it.
B) whether scores on the test make useful predictions of some other behavior.
C) whether the items on the test represent the major topics that the test is supposed to cover.
D) whether the people who score high on the test one time will also score high the next time they take the test.