Geologists in California have discovered a fault near ... ...

   Geologists in California have discovered a fault near the famous San Andreas Fault, one that they believe to be a trigger for major quakes on the San Andreas.
(A)    one that they believe to be a trigger for
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Writing Drills: Warm-Up Drill I