The success of an interest group is measured as whether the government changes its policy. Thus the correct answer is C.
What is interest groups?
An interest group is referred as a group or association of people having similar interests who come together to bring any change in the policy of the government. They are the group's influences on people to seek their majority.
These are established to promote their members' interests in common or concerns. Their primary goal is to influence public policy. They are also known as lobby groups because one of their primary functions is to put more pressure on strategic decisions.
Their majority will sometimes force the government to make changes in the policy as per the interest of the people.
Therefore, option C whether the government changes its policy is appropriate to answer.
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