As Illustrated in the Sample Item-Characteristic Curve Published in Your

As illustrated in the sample item-characteristic curve published in your textbook,the vertical axis on the graph lists the

A) values of the score on the test ranging from 0 to 100.
B) values of the characteristic of the items on a scale of 1 to 10.
C) heteroscedasity of the item curve in values ranging from 0 to infinity.
D) probability of correct response in values ranging from 0 to 1.