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An ideal Item Difficulty index for a multiple-choice question with four options is generally considered to be around:

A) 0.25 (25%)
B) 0.90 (90%)
C) 0.50 (50%)
D) 0.10 (10%)

Correct Answer: C) 0.50 (50%)

An item difficulty of 0.50 maximizes the discrimination potential of the item.

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