Explanation: When performing the scientific method a very important part of it is the experimentation phase as it allows scientists to obtain data from the previously planned experiments and do testing. This data may or may not support the original hypothesis and new experiments and tests might be necessary, therefore collecting the data on each experiment is crucial for any scientific research activity as it can prove or disregard a hypothesis.
The answer is D. Hypothesis
The answer is going to be A. Experimentation.
The correct answer is A. Experimentation!
I hope this helps.
Have a nice day.
hope the answer is useful to you