Answer:
A) hypothesis.
Step-by-step explanation:
Hypotheses are conjectures, speculations, predictions about a particular phenomenon of nature and how it behaves. Assumptions must be tested, which is usually accomplished through experimentation.
On the other hand theories are well-founded explanations for describing events that occur in nature. They involve thoroughly tested hypotheses, facts and laws. A theory may sound like a definitive explanation, but it may be overturned over the years.