The change from 632 feet to 312 feet because there is a decrease. When there is a decrease it is modeled by a negative number. All the others show positive increase.
I would say :
A. A Mother takes her child to the park. She thinks about her high school sweetheart. Her child scraped his knee. The mother decides to quit her job.
Because: It makes no logical sense nor does it carry a fluid storyline like the rest of the answer choices.
It would be "men being devoured Polyphemus's cave." and "Scylla devouring six crew members."!
(: