For Each Example in the Items Below, Identify the Lettered

For each example in the items below, identify the lettered item naming the "wave" or generation in the development of behaviorism to which the item is most closely associated. A lettered item may be the correct answer more than once or not at all.
-Behavior can best be understood, predicted, and controlled by focusing on environmental events to the exclusion of cognitive events.

A) First wave/generation
B) Second wave/generation
C) Third wave/generation
D) All of the above
E) None of the above