A teacher is discussing with a colleague how well the students are learning to work in small-group discussions. The teacher cites Max as an example. He is a highly intelligent and capable seventh grade student who is bored with this year's course content. The only time he appears to be engaged in learning is during small-group discussions. Then, he can often be seen:
a. Lecturing to the other students.
b. Asking other students challenging questions.
c. Reading course material to poor readers.
d. Tutoring students who have learning difficulties.