Which of these responsibilities of US citizenship is considered mandatory?

A.
holding political office
B.
serving in the army
C.
serving on a jury
D.
joining a political party

C. serving on a jury

The official turnout for an election is calculated by dividing the total number of people who voted by which factor?

A.
the number of people in the general population
B.
the number of people who are members of political parties
C.
the number of people who are eligible to vote
D.
the number of people who registered to vote in the election

C. the number of people who are eligible to vote

Which phrase best describes a single-issue interest group?

A.
a group that has concerns covering a wide range of topics
B.
a group that is concerned primarily with issues that financially benefit its members
C.
a group that is concerned with policies that affect the public at large
D.
a group that has concerns about a narrowly defined subject

D. a group that has concerns about a narrowly defined subject

The responsibility of US citizenship that is considered mandatory is serving on a jury.

To arrive at this answer, we need to understand the responsibilities associated with being a US citizen. While there are certain privileges and rights that come with citizenship, there are also responsibilities that citizens are expected to fulfill.

Option A, holding political office, is not considered mandatory for US citizens. Running for and holding political office is a choice that individuals can make if they have the desire and qualifications.

Option B, serving in the army, is also not considered mandatory for US citizens. While military service is highly valued and regarded as a civic duty, it is not an obligation for all citizens.

Option C, serving on a jury, is indeed considered mandatory for US citizens. When called for jury duty, citizens are legally required to participate in the process. The jury system is an essential part of the US legal system, ensuring fair trials by allowing citizens to make impartial judgments.

Option D, joining a political party, is not considered mandatory for US citizens. Joining a political party is a personal choice and is not required by law or citizenship obligations.

Therefore, the correct answer is C. serving on a jury.