What Is the Justice Department's Current Position Relative to Reciprocal

What is the Justice Department's current position relative to reciprocal dealing agreements?

A) The Justice Department actively enforces this illegal activity.
B) The Justice Department is only concerned about these agreements if a large, national company is involved.
C) The Justice Department only gets involved if such an agreement will foreclose a significant share of the market and if the participants agreed not to buy from other competitors.
D) None of the above is correct.