Answer:
The correct option is D. Theory
Step-by-step explanation:
The scientific method of research begins with a question.
To answer this question, a hypothesis is made. A hypothesis can be described as a tentative statement which is testable.
To test the validity of a hypothesis, observations and experiments are made. Based on the results from the observations and experiments, results are drawn and conclusions are made.
A scientific theory is a wide description for a hypothesis which is well tested again and again by observations and experiments. However, with time a scientific theory might change if new researchers are made.