Marko Takes an IQ Test at the Beginning and End

Marko takes an IQ test at the beginning and end of his freshman year of college. If the test is known to be reliable, then:

A) Marko should have similar scores both times he takes the test.
B) Marko's results will be accurate both times he takes the test.
C) the test has adequate sensitivity to assess intelligence.
D) the test is not vulnerable to random error.