During the three months before and the three months after a

During the three months before and the three months after a major earthquake in California, students at a college there happened to be keeping a record of their dreams. After experiencing the earthquake, half of the students reported dreaming about earthquakes. During the same six months, a group of college students in Ontario who had never experienced an earthquake also recorded their dreams. Almost none of the students in Ontario reported dreaming about earthquakes. So it is clear that experiencing an earthquake can cause people to dream about earthquakes.

Which of the following , if true, most strengthens the argument?

A) before the california earthquake, no more of the students in California than those in Ontario recorded dreams about earthquakes

b) the students in California were members of a class studying dreams and dream recollection, but the students in Ontario were not.

c) Before they started keeping records of their dreams,, many of the students in California had experienced at least one earthquake.

D) the students in Ontario reported having more dreams overall, per student, than the students in California did.

E) the students in Ontario who reported having dreams about earthquatkes recored the dreams as having occurred after the California earthquake.