Which One of the Following Outcomes Indicates That a Test

Which one of the following outcomes indicates that a test item should be retained in a test?

A) High performers answered the item correctly and low performers answered the item incorrectly.
B) High performers answered the item correctly and low performers answered the item correctly.
C) High performers answered the item incorrectly and low performers answered the item correctly.
D) High performers answered the item incorrectly and low performers answered the item incorrectly.