$X$: All enzymes act in a unidirectional manner.
$Y$: All enzymes are amphoteric in nature.

• A
  Both statements $X$ and $Y$ are false.
• B
  Both statements $X$ and $Y$ are true.
• C
  Statement $X$ is true and statement $Y$ is false.
• D
  Statement $Y$ is true and statement $X$ is false.