Of the Following,which Is a Form of Political Participation

Of the following,which is a form of political participation?

A) donating money to a charity for homeless veterans -Consider This: Donating money to a charity has no effect on political outcomes.
B) working as a caseworker in a social services agency
C) compiling a statistical analysis on the demographic factors of students enrolled at a local community college
D) calling your representative to express your opinion about upcoming legislation