Which of the Following Is True of Letter Writers and Demonstrators

Which of the following is true of letter writers and demonstrators?

A) They tend to be individuals who have participated in violent or physical expressions of political opinion.
B) They tend to espouse a centrist ideological leaning.
C) They tend to have a greater effect on policymakers than the public opinion polls of the general population.
D) Roughly 10 percent of Americans participate in a mass demonstration or write a letter to the editor each year.
E) Their opinions tend to be more extreme than those of the population as whole.