In the mythological story of Dryope, she was transformed into a tree by the nymph Lotis. This transformation occurred because Dryope picked a flower that was actually Lotis herself. So, the correct answer to the question "Who can you infer transformed Dryope into a tree?" is B. Lotus.
It was not Iole, the country people, or her child who transformed Dryope into a tree, but rather the nymph Lotis. This myth illustrates the consequences of interfering with or disrespecting nature in Greek mythology.