Fact 1: Insulated material can be used for keeping warm. Fact 2: Warm chain is the key to newborn survival. Given the two facts above, what is the key to newborn survival?

Possible answers:
A). deoxyribonucleic acid;
B). insulated material;
C). empty nest;
D). food and shelter;
E). cold bed;
F). Thyroid-stimulating hormone;
G). chemical messengers;
H). eating fish;
Answer:
B).