Item 10 on an Exam Had an Item Difficulty Index

Multiple Choice

Item 10 on an exam had an item difficulty index equal to .00.From this information,one knows that:

A) the item was very difficult and all students answered it incorrectly.
B) the item was very easy and all students answered it correctly.
C) the item was of medium difficulty and half of the students answered it correctly.
D) nothing since there is not enough information provided.