The correct answer is body of principles.
D. body of principles
The correct answer is (D) A body of principles for acceptance or belief by members of a religious, political, or other group; the dogma or tenets of a religion, science, political philosophy, literary school, economic system, etc.
Doctrine comes from Middle English doctrina, Latin doctrina (teaching).
Examples of use:
- Protestants are unable to accept the doctrine of the Roman Catholic Church.
- The doctrine of the Republican Party seems rooted in another age.