b. Why might it be more difficult under the federal antitrust laws for the government to persuade the courts to stop a vertical merger than to persuade the courts to stop a horizontal merger? A. Vertical mergers make it harder for the government to define what the relevant market is, leading some markets to be more narrowly defined than what they should be. B. Vertical mergers make it harder for the government to define what the relevant market is, leading some markets to be more broadly defined than what they should be. C. Vertical mergers do not as clearly reduce competition in a way that is likely to increase market power, leading to higher prices and a reduction in consumer surplus. D. A vertical merger, by giving a firm control of an important supplierlong dashsuch as giving AT&T control of Time Warnerlong dashclearly reduces competition in a way that benefits consumers