The answer for this question is b
His belief that people are self-interested
Letter A is the correct answer.
Observational learning is the ability to learn by witnessing the behavior, emotions and attitudes of other people. This method of learning comes from Albert Bandura's social learning theory and it suggests that there are four conditions necessary for observing and modeling behavior, such as: attention, retention, reproduction, and motivation.
You have been living your whole life on a planet. Planets make up solar systems, solar systems make up galaxies, and galaxies make up universes which make up all of existence in space.