Read the following sentences:

“Going to the house by itself did not worry Sarah. The chains rattling around the back seat next to her, though, were a different story.”

What does the author mean by calling the chains in the back seat a different story?

A. The author means that another story has already been written about the chains in the back seat.
B. The author means that the chains worried Sarah.
C. The author means that Sarah worries too much.
D.The author means that Sarah is used to visiting the house in the country.