Some of the problems cities experienced as a result of rapid growth in the late 1800s included disease, crowded living spaces, and _.

B) Poverty

Explanation:

Unfortunately many people did not have much money to afford the basics such as a decent home and food to put on the table. Even if the person was working, they may be in a very dangerous job that provides little pay. An example could be a factory worker. So this is why choice B is the answer.

There were definitely plenty of able-bodied people, so there wasn't a shortage of workers. This allows us to rule out choice C. There also wasn't a lack of transportation since people either lived close and walked, or they had modes of transport such as rail or bike. Cars were starting to show up in the very late 1800s, but it wouldn't be until the early 1900s is when they became more commonplace. So we can rule out choice D.

Choice A can be ruled out since there were many recreation options such as going to the park or beach, or going to plays or classical music concerts, to name a few ways to have fun.