Final answer:
Interest groups would use grassroots lobbying on issues like education reform, environmental protection, and gun control but are less likely to use it on tax cuts.
Step-by-step explanation:
An interest group using grassroots lobbying would be involved in public pressures, such as organizing marches and demonstrations, to encourage political action on various issues. Typically, this form of lobbying could be applied to causes such as education reform, environmental protection, and gun control. However, while interest groups may lobby against tax cuts that they perceive as harmful or advocate for the reduction of taxes that they find burdensome, grassroots lobbying is more associated with galvanizing public support around a cause, rather than the intricacies of tax policy. Therefore, of the issues mentioned, grassroots lobbying would be least likely used for lobbying about tax cuts.