Final answer:
The appropriate replacement behaviors for Wesley to decrease his nail-biting behavior using DRI are chewing gum and placing hands in the pocket.
Step-by-step explanation:
DRI stands for Differential Reinforcement of Incompatible Behavior, a behavioral technique used to reduce or eliminate unwanted behavior by reinforcing a behavior that is incompatible with the undesired behavior. In the case of nail-biting, the goal is to find a behavior that cannot be done simultaneously with nail-biting.
Among the options provided, the most appropriate replacement behavior for Wesley to decrease his nail-biting using DRI would be:
B. Chewing gum.
Chewing gum is a suitable replacement behavior for nail-biting in this scenario because it's incompatible with the action of biting nails. When someone is chewing gum, they typically cannot bite their nails simultaneously. Engaging in this behavior can redirect Wesley's habit away from nail-biting by providing a different oral stimulation and occupying his mouth, making it less likely for him to engage in the unwanted behavior.
While calling a friend (Option A) or placing hands in the pocket (Option C) might serve as distractions, they are not necessarily incompatible behaviors with nail-biting. Chewing gum, however, is a behavior that can effectively substitute for nail-biting and is more likely to be successful when employing the DRI technique.