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.