Which changes took place in the United States in the late 1800s? Choose all answers that are correct

In late 1800s, in United States, the B. growth of middle class was changing.
Explanation:
Though the industrialization was on the verge of prosperity in the late 1800s, 'mass-production' of goods was not yet being done. More people started to get employed and thus the leisure time that the people had earlier decreased considerably.