How is the president of the united states president from the rulers of dictatorship?

In a dictorship, one person has complete control over a country, state, or union. The President of the U.S does not have complete control over the government, he works with the other branches and all the branches are equal with a system of checks and balances.

answer; /// i believe the correct answer is (b) disposition

the answer is either c or d i think its d