Question

which keywords would be most effective to find research on the benefits of laughter? check all that apply. humor and laughter statistics and benefits benefits and laughter and research statistics and humor and emotional and health humor and emotional and health and research benefits and laughter and medicine and patients statistics and benefits and doctors and patients and disease and health

Explanation:

To find research on the benefits of laughter, keywords should directly relate to laughter and its benefits. "Humor AND laughter" may not focus on benefits. "Statistics AND benefits" lacks connection to laughter. The most relevant combinations are those that include "benefits", "laughter" and optionally related terms like "research", "medicine" etc. Combinations with too many extraneous terms like "statistics AND benefits AND doctors AND patients AND disease AND health" are too broad and may not target laughter - benefits research specifically.

Answer:

C. benefits AND laughter AND research
F. benefits AND laughter AND medicine AND patients
E. humor AND emotional AND health AND research