Mixing of positively charged colloidal solution with negatively charged colloidal solution brings $ . . . . . . $. The decreasing order of coagulating power of $Na^{+}$,$Ba^{2+}$ and $Al^{3+}$ for negatively charged colloidal solution is $ . . . . . . $?

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