The percentage of abundance of three elements $X, Y$ and $Z$ in the earth's crust are about $27.7$,$8.3$ and $46.0$ by mass respectively. $X, Y$ and $Z$ are

• A
  $O, Si, Al$
• B
  $Al, Si, O$
• C
  $Si, Al, O$
• D
  $Al, O, Si$