by shielding them from predators by increasing their food supplies by eliminating diseases by reducing the herd population
I gave my students this multiple choice question: How do harsh winters benefit some species, such as deer?

Only one answer is correct among these 4 choices:
- by shielding them from predators
- by increasing their food supplies
- by eliminating diseases
- by reducing the herd population

Could you tell me which one is correct?

by reducing the herd population