An example of is geese flying south for the winter.
kineses
taxis
migration

The question says,'an example of is geese flying south for the winter. The correction option is D. Some birds are migratory in nature, geese is one of them. Migration is the yearly large scale movement of birds from thier breeding grounds to their non-breeding grounds. Migration usually takes place during winter. Birds usually migrate when food become scarce; they migrate in order to look for suitable shelter, food and safety.