Whenever you are tasked with a writing project, there are a few different strategies that you can follow and that would most likely help you generate ideas for your paper.
In this example, your topic is social problems in America. The first thing you should do is focus on what you already know. You should think of social problems that you are familiar with. This might include subjects such as poverty, malnutrition or crime. An activity that could help you think of such concepts would be brainstorming.
The next step would be researching. You should use information sources in order to learn more about social problems in America. This might lead you to come up with ideas you had not thought about before.
After these two steps, you are likely to have an idea that would be a suitable topic for a paper.
Sentence 4 because it summarizes the paragraph but does not give an opinion like answer but used factual evidence to support it.
Subordinate means someone who is of lower rank in a job. So the manager spoke to someone in a lower rank than him in a cordial tone.
Answer:
D. A cat is a smarter choice of pet than a dog, for most people.
I chose this answer because it sums up what the paragraph above is trying to say.
Hope I helped :)