The correct answer to this open question is the following.
Although there are no options attached we can say the following.
What was the Civil War in Nicaragua about?
The Civil War in Nicaragua was the "guerrilla" confrontation between the Sandinista National Liberation Front and the Army of the Dictator Som*za in 1978. Then, after a couple of years of ruling Nicaragua, the Contrast started to fight the Sandinistas with the support of the United States.
Who did the US initial support?
The United States was so much interested in stopping the spread of Communism in Central America, that is why the federal government of Ronald Reagan decided to support the Contras, to fight against the leftists Sandinistas.
Why did they change their minds?
In 1982, the US government decided to stop supporting the Contras due to the political scandal known as the Iran-Contras scandal, which questioned the authority of President Reagan to control his subordinates.
Finally, there were elections in Nicaragua in 1884. Sandinista commander, Daniel Ortega, under the US government's accusations that the USSR had biased the election.
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The answer is D. Since workers could focus on one specific task, they could focus on doing that task to the best of their ability. This allows them to do that as efficiently as possible, which speeds up the process of production.