Answer:
Option D
Explanation:
In a balanced ecosystem, the flow of resource, food and energy must be adequate enough to fulfill the requirement of all.
In case if the population of deer is higher than the population of producers then the producers would not be able to meet out the requirement of herbivore deer. Hence, this option is incorrect
In case if deer population is less than the population of carnivores, all the carnivores will not be able to get sufficient food. Hence, this option is also incorrect
Option C is also not feasible as equal number of scavengers will not be able to degrade the large biomass of dead animals and plants.
Hence, option D is correct
