In which sentence does the author most clearly define his argument? adapted from The Goal of Sending a Man to the Moon by John F. Kennedy If we are to win the battle that is now going on around the world between freedom and tyranny, the dramatic achievements in space which occurred in recent weeks should have made clear to us all the impact of this adventure on the minds of men everywhere. Since early in my term, our efforts in space have been under review. With the advice of the Vice President, we have examined where we are strong and where we are not, where we may succeed and where we may not. Now it is time to take longer strides—time for a great new American enterprise—time for this nation to take a clearly leading role in space achievement. This in many ways may hold the key to our future on earth. Recognizing the head start obtained by the Soviets with their large rocket engines, we nevertheless are required to make new efforts on our own. For while we cannot guarantee that we