Answer:
d. both b and c
Step-by-step explanation:
Interest groups are parties that come together to support the public opinion and advocate the public needs and demands in front of the government.
These interest groups are accountable to their members and people who vote them. They can easily carry out public riots on roads and use their voice to support the public's agenda.
If they do not do what their groups are based on, they will lose supporters and hence their credibility.