Increased corporate mergers, corporate diversifications, and a tendency toward oligopolies are all results of
(a) synergy
(b) the sherman antitrust act
(c) deregulation
(d) unlimited competition
(e) tougher federal trade commission regulation

The correct answer is (C) deregulation.

Explanation:

Deregulation, liberalization or deregulation, is the process by which a government reduces regulations specific to an economic sector.

In particular, financial deregulation is the reduction of limitations to both financial transactions and financial derivatives, and therefore their solvency guarantees, in order to favor their interests, generally with the excuse of making the financial market more efficient international.