Dr. Yen can increase the likelihood of the participants obedience by letting them know that she has a PhD Degree from a prestigious University.
Option b
Step-by-step explanation:
Dr. Yen is designing an experiment about obedience to authority. She needs more participants. Her PhD degree can help her in this. As it is human psychology that easily trust on big names or brands. So holding a PhD degree from a prestigious University for Dr. Yen will definitely attract the participants and setup an trusty base for all volunteers.
The participants will be more curious to know about the experiment if they know that it is being done by a certified professional. Also several of them wants to learn about the work of Dr. Yen. So this how Dr. Yen can take help of her PhD degree to promote her experiment.