Answer:
Option A: Both firm behavior and market structure
Step-by-step explanation:
The rule of reason is a form of a judicial analysis that address if anticompetitive agreement is actually a advisable or reasonable restraint of trade, courts will look at the agreement's purpose, parties' capacity to implement the agreement to achieve the purpose. It significantly impliese that court studies the things around business practice and deciding if it helps or hurts competition.
An Antitrust is simply a federal and a state statutes to contradict or protest commerce from certain withhold of trade, such as price fixing and others.