A teacher wanted to try out a new test to measure eighth grade students’ knowledge of geometry. The students took the test on Monday and the same test again on Wednesday. Although there were no new geometry lessons that week, the students’ scores were much different. Some scored higher the second time, while others scored lower. This method for determining reliability is called

A. Parallel forms reliability
B. Split-half reliability
C. Test-retest reliability
D. Face reliability

C. Test-retest reliability