In general, the effects of trusts and monopolies on American business have been positive, in that they have created an environment in which they can thrive. This means, however, that they have been mostly negative for consumers, because competition is reduced.
Ronald Reagan was the U. S. president from 1981 to 1989. Franklin D. Roosevelt was also a U. S. president. He served from 1933 to his death in 1945.
Both presidents had an interest in serving for more than 8 years, the currently-accepted maximum length for a presidential term. Franklin D. Roosevelt was president four times, due to his popularity and success in restoring the economy after the Great Depression. Serving for two four-year terms had been an unwritten rule since George Washington, but it was not a law, which enabled FDR to stay in power for longer.
After his death, Amendment XXII was passed, limiting the time a president could serve to two periods of four years. However, in 1987, Reagan made public his interest to get rid of this amendment. He argued that the change would not apply to him, but to leaders from then on.
D is the only non fragment sentence here, so it must be correct
