Cassidy does not know for which course she will register.How could a writer best revise the above sentence to avoid overly formal language?

“Register for” is the natural, everyday phrasing in this sentence. Choice A keeps the meaning while placing “for” at the end, which sounds less formal than the inverted phrasing “for which course” in the original. Choice B keeps that formal structure and adds unnecessary words; choice C is also awkwardly formal.

AI-written and checked against the verified answer.