Answer:
The correct answer is:
"C. were involved in politics."
Step-by-step explanation:
During the Industrial Revolution, the middle class grew in numbers and became increasingly involved in politics, as they gained wealth and social status from the growing industries and commerce. They had more leisure time than working-class people, but still had to work long hours in order to maintain their social status and economic position. Therefore, the statement "shrank in numbers" and "had less leisure time" are incorrect.