Final answer:
Reverend Parris's belief in the supernatural affects his response to his daughter's illness by becoming convinced that witchcraft is involved. This belief is influenced by the Puritan belief system and plays a role in the Salem Witch Trials.
Step-by-step explanation:
Reverend Parris's belief in the supernatural affects his response to his daughter's illness by (c) becoming convinced that witchcraft is involved. In the Salem Witch Trials, Parris was deeply influenced by the Puritan belief system that blamed the works of the devil for society's misdoings. When his daughter fell ill, Parris suspected supernatural causes and later played a significant role in the events that unfolded during the trials.