Final answer:
A Case Study is the research method that provides a rich source of hypotheses regarding a single individual's behavior because it involves an in-depth examination of that individual.
Step-by-step explanation:
The question you've asked pertains to which method provides a rich source of hypotheses regarding a single individual's behaviour. The correct answer is B) Case Study. A case study is an in-depth observational study that involves a detailed examination of a single individual or a small group. Psychologists like Sigmund Freud have used this method to develop major theories of human personality. Although case studies can provide a lot of detailed data about the unique aspects of an individual's behavior, these observations can be challenging to generalize to a wider population because the subjects are often not representative of the general public. On the other hand, experimental designs are controlled experiments with manipulated variables, correlational studies examine relationships between variables without assigning treatments, and naturalistic observations involve observing behavior in a natural setting without interference.