In 1980, a small group of parents personally affected by drunk driving formed the group Mothers Against Drunk Driving (MADD). Over the past four decades, they have grown in number and have lobbied on state and local levels promoting legislation such as stricter limits on blood alcohol levels for drivers. MADD is an example of which of the following?

A
Political party with the goal of influencing public opinion

B
Social movement with the goal of influencing the federal budget

C
Single-issue group with the goal of impacting policy making

D
Bureaucratic agency implementing policy