Discussion

Explanation:

The author only talks about obesity by saying, " Obesity is contagious. If your best friends get fat, your risk of
gaining weight goes up."

This does not mean that obesity is sporadic [appearing at irregular intervals] or that it may be the result of information. Thus, options A and D can be ruled out.
About similar-looking couples, the author says, "but much of the effect is simple imitation of facial expressions".
Thus, option C can be rejected.
In the fourth paragraph, the author says, " Learning from others is how individuals and societies develop".
Thus, option B is true according to the passage.
Hence, the answer is option B.

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