On individual intelligence tests such as the Stanford-Binet and Wechsler scales, an IQ of 100 indicates that the test taker
A. correctly answered all of the items on the test
B. obtained the highest scores in the standardization sample
C. scored at the average level for test takers of the same age
D. scored above the level of the average American adult
E. took as long as the average test taker to answer the test items