Which of the Following Is an Example of the Process

Which of the following is an example of the process of direct democracy?

A) a group of citizens collecting signatures so that the public can vote on whether to enact a law guaranteeing minimum amounts of living space for pregnant pigs
B) a citizen calling her representative to complain about potholes on local roads
C) a citizen who was never active in politics choosing to run for Congress
D) a group of citizens coming together to debate the pros and cons of higher taxes
E) a citizen deciding to contribute money to his preferred presidential candidate