Question

The motivational form of psychological egoism asserts that we always try do what we think is in our own best interest

Answer 1

That statement is true
Psychological egoism believe that even when we choose to help others, we do it because of our own personal reward/benefit.
For example, when we choose to give money to the homeless, psychological egoism argue that it happen because either:
- We want to be seen as good guy by other people around us
or
- We seek the personal satisfaction of 'we've done something good'