The correct answer will be- using the same scientific approach each time.
Explanation:
A scientific method is a systematic procedure to answer and explain the natural phenomenon or events.
The scientific method involves the sequential steps to reach the conclusions which begin with making observations, asking questions, do background research, predict hypothesis and perform experiments to prove or disprove the hypothesis.
The same procedure is used by the scientist's tor reach a conclusion to answer the natural events each time which provides new emphasis on reason.
Thus, using the same scientific approach each time is the correct answer.