How Was the Middle Class Defined During the Industrial Revolution

How was the middle class defined during the Industrial Revolution?

A) people who did not live comfortably or have servants but were better off than the poor
B) people who did not have noble titles but did not work with their hands
C) a portion of the overall population in Britain that drastically decreased
D) the dominant force in the European economy
E) a group that comprised most of the overall population in southern and eastern Europe