Why did the Middle colonies have such a diverse European population?

AThe Middle colonies had a policy of religious toleration.
BThe Middle colonies were the closest to Europe of the American colonies.
CThe Middle colonies had the richest silver mines, which attracted people from all over Europe.
DThe king set limits on how many people from each country could settle in the Middle colonies.

Verified Answer :

AThe Middle colonies had a policy of religious toleration

While

New England was heavily Puritan, the middle colonies granted much
religious freedom to its citizens. For example, Pennsylvania, founded by
the Quaker William Penn, opened its territory up to a wide range of
religious groups including Quakers, Mennonites, Moravians, Lutherans,
Jews, and many others.