Which of the Following Is Generally True of Grassroots Groups

Which of the following is generally true of grassroots groups? 

A)  Grassroots groups are typically ineffective because they lack expertise and give up too quickly. 
B)  Grassroots groups are most often focused at the local level. 
C)  Grassroots groups are relatively unimportant to the environmental movement because so few people are involved in such organizations. 
D)  Grassroots groups focus primarily on issues involving children and youths.