Answer:
C: It's just a theory, it is equivalent to a guess.
Step-by-step explanation:
The famous biologist Charles Darwin's theory o Evolution by Natural Selection is just a theory because he observed behavior and changes in a great variety of plants and animals, and he thought he had found the answer to questions science had on how all these animals and plants came into existence. But it is just a suggestion, a guess, and is not proved by evidence.