The woolly mammoth was a relative of modern elephants that lived in the cold, northern parts of the world less than five million years ago. Mammoths in warmer parts of the world lacked the warm, shaggy fur the woolly mammoth developed.

Which of the following sentences best describes how natural selection resulted in the woolly mammoth?
A.
Mammoths used their hair follicles to grow fur more often, resulting in stronger hair follicles.
B.
Mammoths with thicker fur were more successful at surviving and reproducing in cold climates.
C.
Cold climates triggered the growth of thick, warm fur on mammoths.
D.
Mammoths stopped shedding. Eventually, they lost the ability to shed fur.