prep 1#190 为什么each可以做同位语，而they不行～

190.
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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（being formed 中的being多余；）

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

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，我选的C，我想请教的是：

The books,some owned by Tom, each tells a different story

The books, ome owned by Tom, they tell different stories.

第一句话是对的，第二句话肯定是错的，我的问题是为什么这里用each就对，而换成代词they就不对了呢？如果把they换成all呢？

如果把C选项改为：some formed as commercial ventures, others as religious havens, all had written charters。对么？

E为什么不对呢

只有C没有谓语，其他都有～我想问的是为什么each可以作为放在主语的位置，如果换成了they这样的代词就不对了呢