Sentence Correction

Prospecting for gold during the California gold rush was a relatively easy task, because of
erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the
surface by volcanic activity put gold literally within reach for anybody with a pan or
shovel.


A. because of erosion, prehistoric glacier movement, and ancient, gold-bearing
riverbeds thrust to the surface by volcanic activity put gold literally within reach
for
B. because of erosion, prehistoric glacier movement, and volcanic activity that thrust
ancient, gold-bearing riverbeds to the surface, and putting gold literally within
reach of
C. owing to erosion, prehistoric glacier movement, and volcanic activity that had
thrust ancient, gold-bearing riverbeds to the surface, and putting gold literally
within reach of
D. since erosion, prehistoric glacier movement, and volcanic activity that thrust
ancient, gold-bearing riverbeds to the surface, putting gold literally within reach
for


since erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds
thrust to the surface by volcanic activity put gold literally within reach of