As a result of a revolution in iran during 1978 and 1979, a) iran’s government was replaced by one that was hostile to the united states. b) the cartel of countries controlling part of the oil market decided to increase production. c) the cartel of countries controlling part of the oil market decided to stop production. d) the united states cut off diplomatic relations with iran’s government.

The Iranian Revolution of 1979 overthrew a monarchist government that was allied to the USA to the detriment of an Islamic republic. In this scenario, that country underwent a conservative movement that banished western customs to the detriment of the old conservative customs. Since then diplomatic relations between the two countries have been cut off, with the United States being considered an enemy of Iran, the "great Satan."

So the first alternative is correct (A).

The answer is A. Ira a government was replaced by one that was hostile to the US.

Before the revolution, Iran’s government  was allied with the world powers the US included. Iran was living in a monarchy managed by the Shá. The civilians were not happy about the management of the resources because all the richness of the country was being used with other purposes.

The people was not going to hold on to the situation so the revolution began with the intention of changing the monarchy for a government interested in the country and to kick out the imperialists like the US. They didn’t like the alliance so they were not going to allow it to continue.

i think the answer's are a) b) and c)