A, B, and C are all correct and are issues relevant to this scenario. It looks like Mantra Singh didn’t realize he was operating outside of his professional competence. He may have been well intentioned but failed to recognize that he might not be acting in Sarah’s best interest. Seeing her in such a depressed state, it would have been more appropriate to suggest she seek professional counseling. Promising her that by following his recommendations her problems would be resolved was wrong, and these actions could have caused harm to Sarah if she was unable to get the help she needed.
A teacher does not diagnose or prescribe for medical conditions and does not provide professional advice; these are outside their scope of practice. It is generally a good idea when talking to a student with apparent mental health needs, to suggest they think about seeing a medical doctor or professional therapist for advice and support. There are ways to speak to a student so as to direct them toward answering their own questions. Try phrases such as, “I’ve found this kriya to be helpful for X” or “I know someone who found counseling really helped them. What have you tried?”
D: Incorrect. As Sarah’s original teacher-trainer it was perfectly appropriate for Mantra Singh to listen to what she wanted his advice about. The problem was that instead of suggesting she seek professional help he promised her that by following his recommendations she’d feel better.