帮忙看下这道SC吧

willingariel

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
E. since erosion, prehistoric glacier movement, and ancient, gold-bearing riverbeds thrust to the surface by volcanic activity put gold literally within reach of
答案选E，但是怎么感觉不平衡呢

willingariel

是PREP的一道

feel1979

E很平衡啊，since a,b,and c(分词做定语) put gold .....

willingariel

对对，thrust是分词，

ilvfk

是平衡的，也可以用排除法吧：
because of 和 Owing to不对，所以排除a,b,c
within reach for也不对，排除d

个人意见。。。

jiaoni12

D 选项中缺乏谓语
that thrust ancient, gold-bearing riverbeds to the surface 只是修饰volcanic activity  而已
句子的结构式：Since A, b, and c put. ....