How Does Grassroots Lobbying Differ from Other Efforts by Interest

How does grassroots lobbying differ from other efforts by interest groups to influence governmen?

A) Grassroots lobbying focuses on cultivating relationships with elected officials more than other forms of advocacy.
B) Grassroots lobbying is more effective than other forms of advocacy.
C) Grassroots lobbying is more heavily regulated than other forms of advocacy.
D) Grassroots lobbying focuses on influencing public opinion to support groups' goals more than other forms of advocacy.