Which of the Following Statements Are True Concerning Meta-Analysis

Which of the following statements are true concerning meta-analysis?

A) A meta-analysis considers all studies done to test a particular treatment and tries to reconcile different conclusions, attempting to determine whether other factors played a role in the reported
Outcomes.
B) Meta-analysis is the practice of stating hypotheses after first looking at the data.
C) Meta-analysis is used to prove clinical significance but not statistical significance.
D) Meta-analysis is used to prove statistical significance but not clinical significance.