Joe and Meg are doing a study in psychology. Joe is asked to push a button as soon as he sees a red light whereas Meg is asked to push a red button if she sees a red light and a green button if she sees a green light. From the information, ________ appear to be involved in a task measuring choice reaction time.
a. Only Joe
b. Both Joe and Meg
c. Neither Joe nor Meg
d. Only Meg