Answer:
group of people with common goals who work together to promote their cause
Step-by-step explanation:
Interest groups are also known as advocacy groups and they advocate and create more awareness about their cause to the generals public. This helps in ensuring they have a stronger supportive base. The causes that interest groups fight for could be economic, religious, political etc.
This explains why interest groups not being a group of people with common goals who work together to promote their cause is the right option.