How Did the Market Revolution Affect the "Natural" Social Order

How did the market revolution affect the "natural" social order that fixed most people in the social rank in which they were born?

A) It created a dynamic and unstable social order in which people could both rise and fall in class.
B) It reinforced the existing social order, giving few people opportunities to change their status.
C) Social class distinctions largely disappeared for a brief time in America, as most people entered the middle class.
D) New economic opportunities meant that the class of people with little more than the clothes they wore all but disappeared.