An appeals court may reverse the result of a trial if the judges decide that
A) the defendant was wrongly accused
B) the original judge made an error when interpreting the law
C) the lower needs to retry the case
D) the person who won the lawsuit really should have lost

B) the original judge made an error when interpreting the law.

Explanation:

appeal - A request made after a trial, asking another court (usually the court of appeals) to decide whether the trial was conducted properly. To make such a request is "to appeal" or "to take an appeal." Both the plaintiff and the defendant can appeal, and the party doing so is called the appellant. Appeals can be made for a variety of reasons including improper procedure and asking the court to change its interpretation of the law.