Answer:
D middle class.
Step-by-step explanation:
During the Industrial Revolution of 1800s, the middle class held and controlled most of the factories and industries. As we know that Industrial Revolution had brought about a great change in economy and income generation, the middle class were the ones who gained the most.
The middle class could easily exploit the unorganized labour and working class by forcing them to work for long hours with less wages. Moreover, women and children were paid much lesser than men though they equally contributed in the workforce.
These practices kept the cost of production low while the middle class owners yielded large profits. As a result, this uneven distribution of wealth and income subsequently made the middle class owners more richer and wealthier than the rest of the people.