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 shoved.

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 of 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

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