Answer:
The answer is: Joe acts in a friendly way toward Allison even though he has heard bad things about her, and finds her to be much friendlier than her ex-boyfriend said she was.
Explanation :
A self-fulfilling prophecy from Joe’s perspective would expect Joe to be friendly because he finds Allison easy to get along with—she is amicable (and also sweet and intelligent) or shows friendliness. In a self-fulfilling prophecy, someone’s (Joe) beliefs and expectations about another person (Allison), based on their (Allison) behavior, eventually leads to expectations or self-fulfilling prophecies (from Joe) about the person (Allison) coming to pass—because Allison is amicable or friendly, she will continue to be friendly, and this will make Joe to act in a friendly way towards her.
According to research on the self-fulfilling prophecy, and based on the personal impression (sweet, intelligent, and amicable) that Joe had about Allison even though Allison’s ex-boyfriend informed Joe that she is hard to get along with and very snobby, Joe will act in a friendly way toward Allison even though he has heard bad things about her; also, he will find out that she much friendlier than her ex-boyfriend said she was.