Research was done to study the facial expressions of people, since facial expression clearly shows the emotional state of a person. Researchers found that people who smiled a lot lived longer than those who didn't smile much.
Which statement can be inferred from the passage?
Smiling prolongs human life.
Smiling is associated with human longevity.
Smiling decreases a person's life span.
There is no link between smiling and human longevity.
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