During the french revolution of 1830, liberals were supporters of the
a. upper class
c. lower class
b. middle class
d. royalty

The answer is c. lower class.
"By definition, whoever advocates social change is a liberal. The French Revolution was all about social change. Liberals supported the lower class. There was no middle class, and the upper class was basically just royalty and clergy."

source: https://answers.yahoo.com/question/index?qid=20120827155155AAAhkTh