Concept:Pressure groups are formed around specific causes, so their membership is naturally limited to people directly concerned with those issues.
Explanation:Pressure groups usually limit their membership because they pursue specific and narrow objectives.
Each group is built around a particular interest, such as a trade, profession, or social issue.
Only people who share that exact interest or are directly affected by that issue tend to join.
This focused approach allows the group to use its resources effectively and press its demands clearly.
However, because the aims are not broad enough to attract the general public, the membership base remains small and specialised.
Larger political parties, by contrast, cover many issues and therefore draw wider membership.
Thus, the limited scope of goals is the main reason for restricted membership.
The other options are not correct because pressure groups promote their own members' interests, can have dynamic leaders, and do not primarily serve government interests.
Answer:A. pursue specific and narrow objectives