​When scores on two administrations of the same test are in close agreement, then that test is

A) ​reliable.
B) ​valid.
C) ​both reliable and valid.
D) ​neither reliable nor valid.

When scores on two administrations of the same test are in close agreement, then the test is considered reliable. This means that the test consistently measures what it is intended to measure. Validity, on the other hand, refers to the extent to which a test measures what it is supposed to measure, and this is not necessarily determined by two administrations of the same test. Therefore, the answer is A, only reliable.