Which of the following sentences is incorrect?

a.The movie, that was based off of a novel, kept me on the edge of my seat.

b.The movie, which was over two hours long, kept me on the edge of my seat.

c.The movie, which kept me on the edge of my seat, was based on the director's favorite novel.

d.The movie that we saw was over two hours long.

i think c, am i correct?

Not C.

Remember: you're looking for the INCORRECT sentence.