Answer:
a. supported the structuralist approach to antitrust.
Explanation:
The Aluminum Company of America usually referred to as ALCOA, deals primarily in aluminum ingot.
However, it had a major antitrust case against with the United States of America, which took place in 1945.
The Alcoa case supported the structuralist approach to antitrust.
It should be noted that even though a firm's conduct may be legal, the mere possession of monopoly power violated antitrust laws.