An intensive pronoun is used correctly in sentence A, "Emilia herself didn't realize the spy had gained access codes until the security breach happened.
Intensive pronouns are used to add emphasis. They are usually found directly after the subject in which they modify. Intensive pronouns include the words myself, yourself, himself, herself, itself, ourselves, yourselves, and themselves. In this case, the intensive pronoun is herself because it is modifying the subject, Emilia.
The classroom was interspersed with desks.
He was only married once to a woman named Anne.
Answer:
Happiness comes from believing in others.
