Flocculation value of $$BaCl_2$$ is much less than that of KCl for sol A and flocculation value of $$Na_2SO_4$$ is much less than that of NaBr for sol B. The correct statement among the following is :

A

Both the sols A and B are negatively charged.

B

Sol A is positively charged and Sol B is negatively charged.

C

Both the sols A and B are positively charged.

D

Sol A is negatively charged and sol B is positively charged.