Answer:
a) The justice department became concerned with the activities of Homestore.com because of the growing concentration of ownership within this single association, exhibiting cartel-like behavior.
b) The justice department will consider it a violation of antitrust law if the internet realtor listings are considered to be a part of the relevant market. Option B is correct.
Step-by-step explanation:
Based on the scenario described in the question,
a) The justice department became concerned with the activities of Homestore.com because of the growing concentration of ownership within this single association, exhibiting cartel-like behavior.
This implies that they are making a price ring and they can restrict output, producers can work together for their interest.
Thus, Option D is correct.
b) The justice department will consider it a violation of antitrust law if the internet realtor listings are considered to be a part of the relevant market. Option B is correct.