Answer:
C. testable; supported
Step-by-step explanation:
Behavior can be defined as an organism' or individual's external reaction and activities in response to both its internal and external environments during the phases of its existence.
An explanation for behavior must be testable and supported to be considered a scientific theory.
This ultimately implies that, for a behavior to be considered a scientific theory it must be verifiable (testable) for understanding and there are evidence to support the claim.