On the Eve of the American Revolution, Social and Economic

On the eve of the American Revolution, social and economic mobility in the colonies decreased for all of the following reasons except  

A) earlier wars made Northern merchants rich and created a class of widows and orphans.
B) the supply of unclaimed land in New England began to diminish
C) farmers' sons and daughters were forced to hire out as wage laborers.
D) the average size of New England farms increased dramatically.
E) the gap between owners of large Southern plantations and small farms widened.