Before Giving a Final Exam,Professor Simpson Announces to the Class,"I'm

Multiple Choice

Before giving a final exam,Professor Simpson announces to the class,"I'm sure you'll do well,because you're the smartest group I've ever had." The class average increases from a C after the midterm to an A- after the final.This may be an example of a(n)

A) incorrigible proposition.
B) hypothesis test.
C) theoretical proposition.
D) self-fulfilling prophecy.