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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.

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.