Dave is utilizing behavioral momentum specifically a highprobability highp request sequence This procedure involves presenting a series of requests that the individual is highly likely to comply with highp requests followed immediately by a request that the individual is less likely to comply with lowp request The compliance with the highp requests builds momentum making it more probable that the individual will comply with the subsequent lowp request In this example asking about favorite color and animal are highp requests designed to increase compliance with the lowp request of getting water The text explicitly states that Dave is using both behavioral momentum and the high p request sequence The Premack Principle A involves making access to a highprobability activity contingent upon completing a lowprobability activity first work then play which is different from a sequence of requests DRO B involves reinforcing the absence of a target behavior and response blocking D involves physically intervening to prevent a behavior from occurring neither of which applies here