求助，一道大全题

1.              After crude oil, natural gas is the United States second biggest fuel source and supplied almost exclusively from reserves in North America.

(A) After crude oil, natural gas is the United States second biggest fuel source and supplied almost exclusively from reserves in North America.

(B) Natural gas, after crude oil the United States second biggest fuel source, supplied almost exclusively from reserves in North America.

(C) Being supplied almost exclusively from reserves in North America, natural gas, the United States second biggest fuel source after crude oil.

(D) Natural gas, the United States’ second biggest fuel source after crude oil, is supplied almost exclusively from reserves in North America.（D）

(E) Natural gas is supplied almost exclusively from reserves in North America, being the United States’ second biggest fuel source after crude oil.  解释说A不平行，但我不明白，我觉得and 前后主语一致，supplied 前省略了is ，为什么不对？麻烦大家在百忙中帮我看看，谢谢啦

不能把is省略掉

A选项 and 前面是宾语

      and 后面 确是一个句子     

不平行

所以要加is让2个句子并列

谢谢啦