Dr Hooknose Said, "I've Got to debrief the Subjects" and Walked

Dr. Hooknose said, "I've got to debrief the subjects" and walked into the experimental lab. What is he going to do?

A) Measure the dependent variable.
B) Measure the independent variable.
C) Randomly distribute subjects into groups.
D) Tell the subjects what the experiment is really all about, because he had lied to them earlier.
E) Tell the subjects a story to deceive them, so they won't know the true hypothesis being tested.