The answer is:
They will serve in the military when required.
They will support and defend the US Constitution.
They will show allegiance to the nation's laws
Basically, all naturalized US citizens are required to upheld the same obligations like the citizens that born in united states. Voting in election and volunteering in political campaigns are considered to be the right/freedom of the citizens, not the obligation. You would not face legal punishments if you choose to avoid your rights, but you could face it if you avoid your obligations.
Explanation:
D is the closest answer. The problem was that the naval oil reserves were located in Teapot Dome Wyoming and these reserves were secretly transferred to the Mammoth Oil company. There was no bid. There was no fairness in the transaction. It was motivated mostly by greed, it seems. Harding's administration was riddled with problems. This was just one of them.
William investors a lot of natural resources, friendly basis with England was determined to itself,
Answer:
Replaced at the height of his power, Richard had been compromised by the narrowness of his own power base and his personal inability to live up to the image that he created for the crown. He failed because he misread the signs around him, and was unable to raise the monarchy as an institution with himself at its head.
hope it helps :)