Which ions are present in aluminosilicates?

• A
  $Si^{4+}$ and $Al^{3+}$
• B
  $Si^{2+}$ and $Al^{3+}$
• C
  $Si^{4+}$ and $Al^{2+}$
• D
  $Si^{3+}$ and $Al^{4+}$