C. Postulate

A statement that describes a fundamental relationship between the basic terms of geometry-Postulates are accepted as true without proof.

kasi Si Theorem May Keyword na "True" pero "A statement or conjecture that can be proven true by undefined terms, definitions, and postulates"

Axiom is A statement or conjecture that can be proven true by undefined terms, definitions, and postulates

Answer:

b.defination

Step-by-step explanation:

di ko po alam eh hope it helps sorry