Which three responsibilities should you fulfill if you are a citizen of the United States A) Enroll in mandatory military service upon turning 20
B) Pay taxes
C) stop people from disrespecting the government
D) participate on a jury if needed
E) volunteer in your community

B Pay taxes

Participate in a jury if needed

Stop people from disrespecting government

Explanation:

1 is not true as it is age 18 that you register for the draft and not MANDATORY service

Who Must Register with Selective Service. Almost all men age 18-25 who are U.S. citizens or are immigrants living in the U.S. are required to register with Selective Service. Citizens must register within 30 days of turning 18.

and while vounteering in your community is an awesome thing to do it is not really a responsibility

this can !    

- jack watson

answer; ///he could not explain why the continents drifted;