Answer:
A. The owls would prey on another similar animal as a food source.
Step-by-step explanation:
It is difficult to say exactly what would happen to a local population of owls if their food source of field mice were eliminated, as it would depend on the specific circumstances of the situation.
However, if their food source were eliminated, it is likely that the owls would have to find another source of food.
In some cases, this might mean preying on another similar animal, while in others it might mean eating berries or other plants. In any case, it is likely that the owls would have to make significant changes to their diet in order to survive.