Based on "The Think Tank," which can be inferred from the fact that the article says that Shumaker is "delighted" when Azy makes a mistake? A. Shumaker thinks that Azy only makes mistakes when the question being asked is unfair. B. Azy can tell when Shumaker is bored, and he occasionally makes mistakes to improve Shumaker's mood. C. Shumaker wants to understand how Azy thinks just as much as he wants to teach Azy. D. Azy's mistakes are often signs that he is trying to be playful with Shumaker and make a joke.