Research Indicates That Having Eyewitnesses Rehearse Their Answers to Questions

Research indicates that having eyewitnesses rehearse their answers to questions before taking the witness stand

A) raises uncertainty in the minds of eyewitnesses as to what they actually saw.
B) increases their confidence about what they saw.
C) increases their confidence but also heightens their anxiety about appearing in court.
D) invariably leads them to give a much more detailed and accurate account of what they saw.