Which best explains why a scientist would share these details in a conference

It informs the audience if the study included controlled tests.

Explanation: Usually, scientific conferences involve presentation of papers by scientists. These paper presentations are actually the sharing of details of the scientific research carried out by other scientists.

Presenting the materials and methods section of the a research project  to a scientific conference informs the audience if the study included controlled tests.

The inclusion of controlled tests in a scientific study enhances the validity of the results obtained in the study.

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b i think it’s a water wheel turning in a stream