The American Revolution was mainly cause by colonial opposition to the British attempt to place greater control over the colonies as well as to make them repay the crown for defending them during the French and Indian war.
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The correct answer is He thought they were necessary to oust a Communist-leaning government in Nicaragua.
One of Reagan's most important policies was fighting communism on a global scale. One place where communist was prevelant was Nicaragua. A group called the Sandinistas overthrow the government of Nicaragua in order to establish a communist regime. The group that opposed this communist overthrow was the Contras. This is why answer three is correct.
If memory serves me right, it was Sun Yat-sen who used the methods of civil disobedience.