Here's a problem to solve: A scientist maps a long region in which earthquakes originate and determines this region is a transform plate boundary. Which evidence would cause the scientist to reevaluate this determination?

Among the 4 following options, which is the correct answer?

- A: Volcanism also characterizes the region.
 
- B: Earthquake centers in the region occur at shallow depths.
 
- C: The region shows extensive faulting of sediments.
 
- D: Equal crust densities are found on opposite sides of the region.
 