The correct answer is letter b. many countries boycotted south Africa to protest apartheid. For more than 40 years, people inside and outside South Africa protested against the practice of apartheid. Many Black Africans, including Nelson Mandela, were jailed for there opposition to it. The United Nations declared apartheid "A crime against humanity". Many countries cut off trade with South Africa.
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A scandal involving an illegal break-in at the Democratic National Committee offices in 1972 by members of President Nixon's reelection campaign staff. Before Congress could vote to impeach Nixon for his participation in covering up the break-in, Nixon resigned from the presidency., The falling of Nixon; When people on Nixon's campaign broke into the Watergate Hotel and stole dirt on the Democrats. Although Nixon was not responsible he covered it up and got the blame., Nixon's Impeachment.
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The most significant immediate impact of the Columbian exchange was the cultural exchanges and the transfer of people (both free and enslaved) between continents.