The United States sponsored the contras in Nicaragua because they hoped they would

a curb terrorism
b promote human rights
c limit drug trafficking into the U. S.
d defeat the Sandinistas

D

Explanation:  

Contra or against, shortening of counterrevolutionaries, also self-styled as the Nicaraguan Resistance, is the name given to the groups of insurgents financed by the United States that tried to put an end to the revolutionary government (1979-1990) of the Sandinista National Liberation Front (FSLN), which ruled Nicaragua after the overthrow of the dictatorship of Anastasio Somoza and his family in July 1979.

d

Explanation:

Contra or against, shortening of counterrevolutionaries, also self-styled as the Nicaraguan Resistance, is the name given to the groups of insurgents financed by the United States that tried to put an end to the revolutionary government (1979-1990) of the Sandinista National Liberation Front (FSLN), which ruled Nicaragua after the overthrow of the dictatorship of Anastasio Somoza and his family in July 1979.

d

explanation:

d) in the state of iowa