The most famous restrictive practices case of the last several decades involved a series of lawsuits by: a. some of microsofts competitors
b. all of microsofts competitors
c. U. S. consumers
d. U. S. antitrust regulators

some of microsofts competitors

Explanation:

The antitrust laws is a law that is intent is to prevent companies from playing dirty to make and boost their profits. In recent years, the most famous restrictive practices case of the last several decades involved a series of lawsuits by some of microsofts competitors.

The antitrust laws ensures that a compan is not the only one that control the market, and also does not inflate prices. In 1998, Microsoft was accused that the company wanted dot create a monopoly by giving its browser software for free and was sued.

Also recently, few days before the introduction of Windows Vista by Microsoft to European consumers, there was a group of competitors that said that the European antitrust law was violated by the Windows Vista because it will lead to the decrease in demand for their own applications that are less popular. Some of the competitors involvee in this were International Business Machines Corp., Adobe Inc., RealNetworks Inc., Nokia Corp., and Sun Microsystems, Inc.