Given the fact "An example of migration is birds flying south in the winter", what is the answer to the question or completion "What would be an example of migration?"

Options are: [-] Geese leaving Michigan for Florida when temperatures are dropping [-] Cattle going to the barn to sleep at night [-] Bats flying at night to catch mosquitoes [-] Bees flying to a patch of clover flowers
Geese leaving Michigan for Florida when temperatures are dropping