Answer:
B) It focused on improving the lives of very depressed people.
Explanation:
The answer to the question here is B. The text has repeatedly suggested different ways to improving the lives of very depressed people. Improving the lives of depressed people is kind of like the main idea of psychology. The answer to the question has to be B) It focused on improving the lives of very depressed people.
Here are the answers to the given statements above:
1. The given sentence is an example of a complex sentence. This sentence includes an independent clause and dependent clause.
2. The given sentence is an example of a simple sentence. It only contains one independent clause.
3. This is an example of a fragment sentence, which misses the predicate.
4. This is an example of a simple sentence having a compound predicate. Hope this answer helps.