Final answer:
Evolution is a theory because it is supported by data from various scientific fields.
Step-by-step explanation:
The correct answer to this question is option B. Evolution is considered a theory because it is supported by data. In science, a theory is a well-substantiated explanation of a natural phenomenon that is based on a collection of evidence and observations. It is not a hypothesis, which is a proposed explanation that can be tested. Additionally, although evolution has not been proven in the sense of absolute certainty, it is strongly supported by a vast amount of empirical evidence from different fields of study such as paleontology, genetics, and anatomy.
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