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what advice does the doctor give reverend parris?
to send for a more experienced doctor in boston
to leave betty alone until she tires of pretending to be ill
to look for a supernatural cause for betty's illness
to let betty sleep until she feels better

To look for a supernatural cause for Betty's illness.

Explanation:

This is the advice that the doctor gives to Reverend Parris. At the beginning of the play, we learn that Betty is not waking up. Worried, Reverend Parris has sent for a doctor who can explain what is happening to Betty. The doctor, however, has no explanation for this behaviour. Instead, he advises Reverend Parris to look for a supernatural explanation. This contributes to creating the supernatural narratives that permeate the story.

in our power to make a world happy - to teach mankind the art of being so - to a character hitherto unknown - and to have, as it were, a new creation intrusted to our hands, are honors that command reflection, and can neither be too highly estimated,