MrGaydos Wants to Teach His Students How to Perform the Heimlich

Mr.Gaydos wants to teach his students how to perform the Heimlich maneuver.Three of the following strategies should help his students learn the maneuver more effectively.Given what we know about teaching procedural knowledge, which strategy is least likely to be effective in helping students learn the procedure correctly?

A) Mr.Gaydos can give his students an opportunity to practice the maneuver on a realistic human dummy.
B) Mr.Gaydos can show his students pictures of the various steps involved in the maneuver.
C) Mr.Gaydos can describe Dr.Heimlich's medical background and his motivation for developing the procedure.
D) Mr.Gaydos can encourage his students to talk themselves through the procedure as they perform it.