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We need to explain the phrase in the given part is fit for the question or not.

A. One experiment proves the hypothesis
Remember that an experiment is intended to confirm or reject the hypothesis. Whether or not your theory was disproven, your experiment was a success.
In proving a hypothesis, reliability and validity are important. Reliability is about consistency, and validity is about accuracy which can only be acquired by doing an experiment about the measure multiple times to ensure that it is consistent and accurate. So, the answer is not the letter A.

We need to explain the phrase in the given part is fit for the question or not.

B. Many experiments validate the hypothesis
Remember that an experiment is intended to confirm or reject the hypothesis. Whether or not your theory was disproven, your experiment was a success.
Reliability and validity are vital in proving a theory, as previously stated. These two can only be acquired by doing an experiment about the measure multiple times to ensure that it is consistent and accurate. Therefore, the answer is the letter B.

We need to explain the phrase in the given part is fit for the question or not.

C. You think your hypothesis is correct
Remember that an experiment is intended to confirm or reject the hypothesis. Whether or not your theory was disproven, your experiment was a success.
It is insufficient to simply believe and assume that your theory is valid; this will lead to inaccuracy, particularly if it is not supported by facts, relevant data, and experiments. So,the answer is not the letter C.