Which of the Following Study Designs Best Illustrates a Scripted

Which of the following study designs best illustrates a scripted social interaction experiment?

A) The participant first views a highly amusing video and completes a spatial rotation task. They then view a sad video and complete the spatial rotation task again.
B) The participant is instructed to walk down the hall to begin the experiment, and while they are walking a confederate bumps into them and makes a rude comment. The participant's arousal level is then measured
C) The participant is asked to keep a diary account of their everyday conversations for two weeks and report on how their daily interactions make them feel
D) The experimenter uses a script to instruct the participants on how to make a series of facial expressions, then measures how the participant's blood pressure and heart rate changes as a result of the posed expression