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The correct answer is:
A. The president fills the roles of head of state and head of government.
Explanation:
1. The head of state represents the country symbolically and ceremonially. The president of the United States serves as the head of state.
2. The head of government is responsible for the everyday administration of the state. The president also fills the role of head of government in the United States.
By serving as both head of state and head of government, the president of the United States carries out a range of duties that encompass ceremonial, symbolic, and administrative functions, making option A the correct choice.