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"To our sister republics south of our border, we offer a special pledge: to convert our good words into good deeds, in a new alliance for progress; to assist free men and free governments in casting off the chains of poverty. But this peaceful revolution of hope cannot become the prey of hostile powers. Let all our neighbors know that we shall join with them to oppose aggression or subversion anywhere in the Americas. And let every other power know that this Hemisphere intends to remain the master of its own house."

The bolded sentence in the selection above signifies a shift in tone. Which sentence below best explains Kennedy's tone after the shift?

He is letting enemies know that they will not be allowed to have an influence in the Americas. His tone is cautionary.
He is stating that the United States will support people and governments in the Americas, but cannot pledge to fight enemies outside of the country. His tone is regretful.
He is suggesting that other countries are poor. His tone is sorrowful.
He is warning other countries that the United States will support peaceful revolutions. His tone is regretful.

Answer: The right answer is the A) He is letting enemies know that they will not be allowed to have an influence in the Americas. His tone is cautionary.

Explanation: Just to elaborate a little on the answer, it can be added that Kennedy's tone is clearly cautionary. His words are far from being regretful or sorrowful—although he is implying that those "sister republics south of our border" that the United States aims to protect have poverty issues, and that his country will support their peaceful revolutions of hope—so options B, C, and D can be discarded. Kennedy also agrees to fight those republics' enemies, so the first statement in option B is also incorrect. In these lines Kennedy is publicly providing political support to Latin America and warning other powers against their intention to influence the US or other country in the Americas.