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I believe the answer is C.
The entry of the US into WWI really boosted the Allied Powers' morale, while destroying the morale of the Central Powers.
While the rest of the Allies had been fighting for nearly four years at this point, when the US entered, they were fresh, energized, and idealistic.
Basically, US soldiers encouraged the other Allies and helped them get their mojo back.
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.