Identify the correct decreasing order of precipitation power of the flocculating ion added from the following.

• A
  $Al^{3+} > Ba^{2+} > Na^{+}$
• B
  $Ba^{2+} > Al^{3+} > Na^{+}$
• C
  $Al^{3+} > Ba^{2+} > Na^{+}$
• D
  $Na^{+} > Ba^{2+} > Al^{3+}$