<span>William James suggested that, "to be cheerful, . . . act as if cheerfulness were already there." William James was a philosopher and psychologist and his theory was that if a person acted as though they were already happy, they would attract more happiness.</span>
A conjunction can be placed after the comma to make the sentence make sense (i.e. and, so, ect).
D: Premonition
that is the correct answer
I believe the correct answer is A) self-assured but inexperienced, but I am not 100% sure.