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Hagrid

The first person in the door was she.A.predicate nominativeB.object of a prepositionC.subjectD.direct object

The first person in the door was she. The answer is letter B. The object of preposition.

WorldlyGlass49
You didn't underline or italicize anything.

The first person would be a predicate nominative.
The door would be object of a preposition.
She would be a subject.