Statement $X$: Humans exploit mammals for obtaining milk.
Reason $Y$: Naturally,milk is intended for the nourishment of the animal's offspring.

• A
  Both Statement $X$ and Reason $Y$ are true,and Reason $Y$ is the correct explanation of Statement $X$.
• B
  Both Statement $X$ and Reason $Y$ are true,but Reason $Y$ is not the correct explanation of Statement $X$.
• C
  Both Statement $X$ and Reason $Y$ are false.
• D
  Statement $X$ is true,but Reason $Y$ is false.