Citizens are required to be A: born in the United States
B: involved in the military
C: loyal to the federal government
D: members of a charitable organization

I think C, but maybe none of the above. (Depending on the strict definition of "Loyal".  You have to follow Federal laws though so I think it is C.

Explanation:

You do not need to be born in the USA to be a citizen, you can become a naturalized citizen through a legal immigration process, or marriage, or if your parents are both citizens you are automatically a citizen when you are born.

You do not need to be involved in the military to be a citizen.

You can't be against the federal government, or commit treason so I think it is C.

Being a member of a charitable organization is optional and not required for citizenship,

yes

explanation:

the fighting words doctrine, in united states constitutional law, is a limitation to freedom of speech as protected by the first amendment to the united states constitution. in 1942, the u.s. supreme court established the doctrine by a 9–0 decision in chaplinsky v. new hampshire.

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.