Question: Which of the following statements best explains why earthquakes occur more frequently in California than in Massachusetts?

  Options: 
 A. The rock found in California is igneous, but the rock found in Massachusetts is sedimentary.
 B. California is located on the boundary of two crustal plates, but Massachusetts is not.
 C. The rock under California is soft, but the rock under Massachusetts is hard.
 D. California is located on a continental plate, but Massachusetts is not.
Answer: B