Is an institution or group of people that maintain order, protect the people, provide services, and support or manage the economy.
a.
anarchy
b.
government
c.
chaos
d.
national security

B. Government

Explanation:

Anarchy doesn't need an institution, cause there's no head of State

Chaos don't maintain order (It's a contradiction)

National Security doesn't manage economy

Government

Chaos is complete disorder or confusion
craziness

National security is the security of a nation state, including its citizens, economy, and institutions, which is regarded as a duty of government.

Anarchy is a of disorder due to absence, nonrecognition of authority