Therapeutic Touch (TT)is a Type of "Energy" Medicine That Involves

Therapeutic touch (TT) is a type of "energy" medicine that involves the practitioner moving his/her hands over the energy field of the patient,without actually touching the patient,but redirecting the energy field to heal the patient.If a researcher were to design a survey of TT practitioners and their patients to determine the validity of TT,which of the following questions would NOT be helpful in determining the validity of the survey?

A) Is the researcher a regular TT practitioner or patient?
B) Do the survey participants have a working relationship with the researcher or were they paid to participate?
C) Are any non-TT patients included in the survey?
D) How old is the researcher?