on adding `AgNO_(3)` solution into KI solution , a negatively charged colloidal sol is obtained when they are in :
A. 100mL of 0.1M `AgNO_3+100mL`of 0.1M KI
B. 100mL of 0.1M `AgNO_3+50mL`of 0.2M KI
C. 100mL of 0.2 M `AgNO_3+100mL`of 0.1M KI
D. 100mL of 0.1M `AgNO_3+100mL`of 0.15 M KI