The Father of One of Your Students Criticizes the Fact

The father of one of your students criticizes the fact that you base your grades partly on students' paper-pencil test scores.You need to defend your use of such tests as a way of evaluating students.Three of the following are appropriate ways you might respond to the father's concern.Which statement is not accurate?

A) Your tests have been shown to have perfect reliability.
B) Your tests provide a way of obtaining systematic samples of your students' performance.
C) You have determined that your tests have content validity for the material you cover in class.
D) Using tests is a fairer and more objective way to evaluate students than grading simply on the basis of your subjective impressions.