Answer:
[C] Is legal even though it is ethically questionable
Step-by-step explanation:
Some actions and behaviours can be legal but unethical or ethically questionable. They are legal in the sense that no contractual laws or pre-agreed contractual terms are broken when engaging in such actions. They may, however, be ethically questionable because they are do not conform to professional or moral conducts and societal norms.
The primary reason to join a religious sect should be a level of belief in the tenets of the sect, therefore, joining such with the singular motive of selling securities to its members is a behaviour that is not unlawful but is professionally, socially and morally questionable as a stockbroker and belonging to a religious sect.