The direction of energy flow is

• A

  Producers $\rightarrow$ Herbivores $\rightarrow$ Decomposers $\rightarrow$ Omnivores
• B

  Producers $\rightarrow$ Carnivore $\rightarrow$ Herbivores $\rightarrow$ Decomposes
• C

  Decomposers $\rightarrow$ Carnivores $\rightarrow$ Herbivores $\rightarrow$ Producers
• Correct answer
  D

  Producers $\rightarrow$ Herbivores $\rightarrow$ Carnivores $\rightarrow$ Decomposers

Solution

In an ecosystem, the direction of flow of energy is always in this pattern.

Hence, the correct answer is option: 'D'.