In General, Which of the Following BEST Summarises How Convincing

In general, which of the following BEST summarises how convincing eyewitness testimony is to jurors?

A) Not very convincing - even when jurors have reason to believe that the eyewitness had good opportunity to study the criminal's appearance
B) Not very convincing - unless the eyewitness is reporting having seen a good friend, relative, or other highly familiar person commit a crime
C) Very convincing - unless jurors have reason to believe that the eyewitness had impaired vision at the time of the crime
D) Very convincing - even when jurors have reason to believe that the eyewitness had impaired vision at the time of the crime