Parents warn a new babysitter that their son, dennis, is very aggressive and mischievous. as a result of this initial expectation, the babysitter starts calling dennis "dennis the menace," and he behaves in ways that elicit aggressive and mischievous behaviors from dennis. this example best demonstrates the phenomenon :
a. the self-fulfilling prophecy
b. the self-serving bias
c. the fundamental attribution error
d. social conditioning