PREP1-190

The thirteen original British colonies in North America, some formed as commercial ventures, others as religious havens, each had a written charter that set forth its form of government and the rights of the colonists.

A. some formed as commercial ventures, others as religious havens, each had a written charter

B. some being formed as a commercial venture, others as religious havens, all of which had written charters

C. some that formed as commercial ventures, others as religious havens, all had written charters

D. with some being formed as a commercial venture, others as religious havens, all had a written charter

E. with some formed as commercial ventures, while others as religious havens, each had a written charter

答案是A，不理解A中others前后，分别省略了连词和formed，如果这两句是作为平行的话。

我的理解有错吗？请指教。