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my question-also explain your answer

which sentence is wrong because it's not parallel?
a.) big wave surfing is supposedly both a tremendous thrill and an extraordinary danger.
b.) big wave surfing is supposed to offer both tremendous thrills and extraordinary dangers.
c.) big wave surfing is supposed to be both tremendously thrilling and extraordinarily dangerous.
d.) big wave surfing is supposed to be both tremendously thrilling and an extraordinary danger.