The antitrust case that ended the use of the "rule of reason" by the Supreme Court was the ________ case.

A) American Tobacco
B) ALCOA
C) U.S.Steel
D) IBM

The antitrust case that ended the use of the "rule of reason" by the Supreme Court was the ALCOA case in 1945. The rule of reason was a legal principle that required courts to evaluate whether business practices were reasonable or unreasonable, rather than automatically considering them illegal. The Supreme Court's decision in the ALCOA case shifted the focus to a more strict standard that looked at whether a business had a monopoly or attempted to monopolize a market.