A. Crying helps get the hurt out.
B. Laughing is good, but it is not a substitute for good health.
C. Laughter is the very best medicine.
D. Laugh, and the doors will open.
Me personally, I think that your correct answer would be "Laugh, and the doors will open." I think this would be the answer because the author allows the reader to empathize with Persephone.
To answer your question the answer will be C. laughter is the very best medicine. Neruda is trying to convey that message and show that all he needs is her laughter.
