Answer: Option B
Step-by-step explanation:
The fire wipes out all the available food in the forest then the deer population will be reduced. This is because there will be no food available to the deer as a source of energy.
The organism eats food to get energy and survive and failing to do so will kill the organism.
According to the food chain the organism in one tropic level will affect the life of another level. So, loss of nutrient will kill deer.