Answer:
The goal that Kennedy wants to accomplish in this excerpt from a speech to a Congress in 1961 is C: Put an American on the moon and return him safely to the Earth.
Step-by-step explanation:
His intention is very clear at the beginning of the excerpt when he says: "I believe this nation should commit itself to achieving the goal, before this decade is out, of landing a man on the moon and returning him safely to the Earth." He believes this goal will be very important to achieve, not only for himself as a president, but also for the Nation; this man would represent the entire American Nation.