A Theory Is A(n)

A theory is a(n) :

A) plausible or scientifically acceptable, well-substantiated explanation of some aspect of the natural world.
B) well-substantiated explanation of some aspect of the natural world.
C) organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena and predict the characteristics of as yet unobserved phenomena.
D) All of the answers are correct.