Statement $X$: The cell membrane is the main structural component.
Statement $Y$: It is the site for electron transport and is a selectively permeable membrane.

• A
  Both Statement $X$ and Statement $Y$ are correct.
• B
  Statement $X$ is correct but Statement $Y$ is incorrect.
• C
  Statement $X$ is incorrect but Statement $Y$ is correct.
• D
  Both Statement $X$ and Statement $Y$ are incorrect.