Which One of the Following Teachers Is Using a Strategy

Which one of the following teachers is using a strategy that reflects the concept of distributed intelligence?

A) Mr. Arvis asks students to exchange and grade one another's homework assignments.
B) Mr. Baker encourages his students to use their calculators when solving algebraic word problems.
C) Mr. Chinn gives easy writing assignments at the beginning of the year and raises his expectations as the school year progresses.
D) Mr. Devlin encourages his students to relate what they are learning in social studies to their own personal experiences.