Final answer:
The hawk receives the least amount of energy from the producers in the food chain.
Step-by-step explanation:
In an ecosystem, energy flows from the producers (plants) to the herbivores (like rabbits and grasshoppers) and then to the predators (like hawks and mice).
Since each organism in the food chain consumes a portion of the energy from the organism it consumes, the predator at the top of the food chain receives the least amount of energy from the producers.
Therefore, in this case, the answer is (a) Hawk.