Art history
should be changed to
Art History
I would help you out, if you had included the excerpt.
Answer :
Parallel structure is referred to as a situation in English grammar where a grammatical form or structure is repeated within a sentence. Each grammatical form, being similar in structure, thus creates a parallel structure. Parallel structure helps in establishing balance and flow in a sentence. The correct answer with parallel structure is :
The concert begins at nine; it ends at midnight.