Answer:
B. Whether private businesses change their practices in response to pressure
Step-by-step explanation:
The success of an interest group can be measured in various ways, but one common way is:
B. Whether private businesses change their practices in response to pressure
This is because interest groups often seek to influence private businesses and industries to change their policies or practices in ways that align with the group's goals or values. If an interest group is successful in achieving this objective, it can be seen as a measure of its effectiveness and impact. Other measures of success may include whether the government changes its policy or how many members the group can sign up, among other factors.