Why A?

@lerondagates, The theorists hypothesize that jurors perceive the evidence as more credible in the courtroom because judges prescreen any scientific evidence. This argument depends on the assumption that the jurors are actually aware of this fact that judges prescreen the evidence. If the jurors are unaware of it, it cannot impact their perception and there must be an alternative reason why they see evidence in the courtroom as more credible. (A) correctly summarizes the necessary assumption. Let me know if you have any other questions.