The Courts Use the Rule of Reason to Decide Many

The courts use the rule of reason to decide many antitrust cases because:

A) the courts consider the facts surrounding a case to decide if a practice hurts or helps competition
B) it is reasonable to compare a case being tried to a previous case and use the decision from that case
C) the courts would rather use the rule of reason than go through a detailed economic analysis
D) all practices attacked under antitrust laws are anti-competitive and thus prohibited
E) none of the other choices