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The most suitable answer is

1) by using U.S. troops to remove the communist leadership in Grenada.

During 1983 The United States started the invasion of Grenada, a Caribbean country. In 1979 Grenada began to develop a closer relationship with Cuba under Maurice Bishop’s government, and by 1983 Bernard Coard, a Marxist leader, assesinated Prime Minister Bishop and took control of the governmet.

President Reagan in an attempt to protect U.S. citizens  in Grenada from the violence, sent troops to the island, and resulted in the collapse of Coard’s government and the appointment of an interin government.