Answer:
d. prescriptive and descriptive
Step-by-step explanation:
The study of ethics involves two main branches which are classifies as prescriptive and descriptive.
In this the common ethics are sometimes not that common to be understood, and followed.
Since, some ethics are prescriptive that is desirable and some are descriptive that is asked to be followed with the norms associated with it.
Thus the study of ethics involves two main threads:
Prescriptive and the other is Descriptive