Which of the following provides the best biogeographical evidence to support the theory of evolution?

A.
Harbor seals can be found across a wide range of shorelines in the Pacific ocean.
B.
Marsupials are found almost exclusively in Australia.
C.
Cockroaches can be found on almost every continent.
D.
Penguins typically reside in the northern hemisphere.

B. Marsupials are found almost exclusively in Australia.

This evidence supports the theory of evolution by showing how species that evolved in isolation in a specific geographic area have unique characteristics that have led to their distribution in that region.