What Is an Item Characteristic Curve

Multiple Choice

What is an item characteristic curve?

A) a line that describes the probability of answering an item correctly plotted against the level of ability on the trait being measured
B) a line that describes the distribution of responses to a single item on the trait being measured
C) a histogram constructed for the responses to a single item on the trait being measured
D) a line similar to the normal curve that results from graphing the discrimination index against difficulty level for the trait being measured ______.