Statement $S$: $90\%$ of the world's fish production comes from freshwater.
Reason $R$: Hilsa,Sardines,and Major Carps are freshwater fish.

• A
  Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
• B
  Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
• C
  $S$ is true and $R$ is false.
• D
  Both $S$ and $R$ are false.