In the "point" essay of “mandatory service”, which of the following is a reason the author gives for making military service mandatory?

it  should be every citizen´s moral duty to defend their country,therefore strengthening their citizenship ties. All citizens,men and women should have the right to fight for their homeland encouraging fairness,and finally mandatory service would unite the country against whatever threat.

The correct answer is:

(D)  All of the above.

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but i think it is 2

a and b are the correct answer to what your looking fior