Which sentence is grammatically correct?

Question

A) I was at the movies when halfway through the power went out. 
B) I was at the movies, when halfway through, the power went out. 
C) I was at the movies when halfway through, the power went out.

Accepted Answer

Neither. 
I was at the movies when, halfway through, the power went out.

Answer

Technically, all of the choices are not grammatically correct, but I think "b" is the answer.

Answer

Yay English tests. 😂

Answer

none of the above, actually.
I was in the movies when, halfway through, the power went out.

Answer

If I’m ever questioning it, I just say it in my head like dramatically and like a narrator would say it. There would be pauses between “when halfway through” and “the power went out” , so the pauses are where commas would be. I think??

Which sentence is grammatically correct?

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