Three of the Following Experiences Should Promote Higher Self-Efficacy About

Three of the following experiences should promote higher self-efficacy about the task in question.Which one probably won't?

A) Andrea discovers that she does well on her weekly spelling tests only when she wears her lucky necklace.
B) On the first day of geometry, Bob's teacher tells the class, "The things in your textbook may look difficult to you now, but with a little effort and practice you'll have the basics down pat by December."
C) Carmella does better in her Spanish class than she expected to.
D) Dick's friend tells him, "You shouldn't have any problem in American Literature.I'm no smarter than you are, and I got an A."