Of the following, which is the best example of appropriate praise given to a child?
a. "no wonder your mother always calls you 'mr. clean.' you're always willing to clean up after yourself."
b. "thank you for your help today in cleaning up the classroom. you really did a great job."
c. "what a good guy you are. i know i can always count on you to help me clean up."
d. "you're always so helpful. thanks for helping me clean up the classroom today."