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Question: Which of the following sentence is correct?

a.

Results suggests that exercise alone may not be enough to eliminate risks associated with too much sitting.
b.

Results which suggests that exercise alone may not be enough to eliminate risks associated too much sitting.
c.

Results suggest that exercise alone may not be enough to eliminate risks associated with too much sitting.
d.

Results suggesting that exercise alone may not be enough to eliminate risks associated with too much sitting.