The correct answer is C. To motivate Congress to work together.
Step-by-step explanation
The excerpt from John F. Kennedy's speech talks about the role of Congress in bringing hope to the population by saying that "Our overriding obligation in the months ahead is to fulfill the world's hopes by fulfilling our own faith" Additionally, it shows the main purpose of John F. Kennedy to propose to the members of Congress the union to work all for the same goals in the first sentence by saying "Members of the Congress, the Constitution makes us not rivals for power but partners for progress". According to the above, the correct answer is C. To motivate Congress to work together.