Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.

A. of; at
B. by; in
C. of; on
D. on; at
C
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Scientists are convinced    the positive effect of laughter   physical and mental health.   

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Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.

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Scientists are convinced ___ the positive effect of laughter ___ physical and mental health.

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