Concept:A pressure group is an organization formed to influence government decisions and policies.Explanation:The question asks for the group whose main goal is to influence government policy.A pressure group works from outside the government to shape public policy in favor of a specific cause or interest.It does not seek to win elections or run the government, unlike a political party.Civil service and public corporation implement policy rather than pressure the government.Therefore, the correct association is a pressure group.Answer:B. pressure group