According to the Text, Cross-Examination Does Not Seem to Be

According to the text, cross-examination does not seem to be effective at rooting out eyewitness mistakes primarily because:

A) The prosecution can always come back after cross-examination and rehabilitate the witness.
B) Most jurors have already made up their minds about the testimony before cross-examination.
C) The eyewitness is hard to undermine if they honestly believe they are telling the truth.
D) The judge is not likely to allow eyewitnesses to be badgered in a cross-examination.