Hello. You did not inform the article to which this question refers, which makes it impossible for it to be answered accurately. However, I will help you in the best possible way.
Zitkála-Šá wrote "side by side" to show his skills and talents in relation to writing and speaking. This is because, because she is indigenous and a woman, she was constantly underestimated by students and great academic names, who doubted her ability to reason and write something so remarkable and punctual. With "side by side" she won a public speaking contest and established herself as a great thinker and writer.
The Congress of the United States in fact retains most of the power in these two areas relative to the President and the individual states, with Congress having the power to declare war and confirm ambassadors appointed by the President.
The answer is B.
The U.S. military is subordinate to the Federal (civilian) government. Note that the US Congress controls the budget, and that the President is required to ask for a declaration of war, and the Congress then votes to approve or disapprove the request.
Apparently, she wrote some dirty jokes in her diary.