Which one of the following is most strongly supported by the information in the passage?

mayatassi on September 1, 2022

Please explain

Can you please explain why D and not B is the correct answer? Thanks.

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Emil-Kunkin on September 2, 2022

Hi Mayatassi,

While we do know that NGF was the first factor found, we do not know that others are not better understood. We do not have any support for that in the passage. D is correct partly because of the opening paragraph, which does imply that NGF is not the only factor, and that the factors perform "some specialized functions."