Among the following, the false statement is

• A. Tyndall effect can be used to distinguish between a colloidal solution and a true solution.
• B. It is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aero plane.
• C. Lyophilic sol can be coagulated by adding an electrolyte.
• D. Latex is a colloidal solution of rubber particles which are positively charged.