Answer: a. What motivates people.
Step-by-step explanation:
According to the doctrine of Psychologism Egoism, people are always motivated to act following their own interests, meaning that all human motivation is egoistic. This theory, therefore, is about what motivates people´s actions. Is not about what is good and right, as the motivation is considered ultimately egoistic. The theory establishes no relation between motivations and religion, nor normative ethics, or specific rules as deontology would suggest.