Omega, Inc., controls 80 percent of the market for telecommunications equipment in the southeastern United States. To show that Omega is monopolizing that market in violation of the Sherman Act requires proof of

a. only the possession of monopoly power in the relevant market.

b. only the willful acquisition or maintenance of monopoly power.

c. the possession of monopoly power in the relevant market and the willful acquisition or maintenance of that power.

d. none of the above.