2. In the five years from 2010-2015, there were no earthquakes in the state of Pennsylvania. On the other hand, southern California, which is similar in size to Pennsylvania, experiences nearly 10,000 earthquakes a year.
Which of the following statements might best explain this difference in the frequency of earthquakes?
A Unlike California, Pennsylvania is not situated near a plate boundary where earthquakes are frequent.
B. Compared to California, Pennsylvania is in a time of minimal earthquakes, but will eventually have more.
C. Pennsylvania sits on top of more stable crust than California does, and is therefore resistant to earthquakes.
D. Pennsylvania has fewer seismographs than California and is unable to detect all of the earthquakes in the region