Given below are two statements.
Statement $I$ - The amount of energy available in an ecosystem increases at each successive trophic level.
Statement $II$ - Transfer of energy from one trophic level to the other follows $10\%$ law.
In the light of above statements, select the correct option given below:

• A
  Both statement $I$ and statement $II$ are correct.
• B
  Both statement $I$ and statement $II$ are incorrect.
• C
  Statement $I$ is correct but statement $II$ is incorrect.
• D
  Statement $I$ is incorrect but statement $II$ is correct.