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An item has a discrimination index of 0.20. Based on the stated acceptable range, the most appropriate interpretation is:

A. The item demonstrates excellent discrimination
B. The item has inadequate discrimination
C. The item guarantees high validity
D. The item is necessarily too difficult
Correct Answer: B. The item has inadequate discrimination

A discrimination index of 0.20 is below the commonly accepted range, so the item discriminates inadequately.

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