County, state, and local committees all choose a chairperson. However, the party's presidential candidate chooses the chairperson at the level.

D. national

Explanation:

County, state, and local committees all choose a chairperson. However, the party's presidential candidate chooses the chairperson at the national level. The presidential candidate selects their chairperson from anywhere in the nation, whereas county, state, and local chairpersons are chosen specifically from the county, state, local area.

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