What Is Predicted by the Group Polarization Effect

What is predicted by the group polarization effect

A)  When most of the group members initially favour a cautious decision, discussion will cause the group to adopt a risky decision. 
B)  The gap between two opposing factions will be narrowed after group discussion. 
C)  Group decisions will always be better than individual decisions. 
D)  When most of the group members initially favour a cautious decision, discussion will cause the group to adopt an even more cautious decision.