It looks like India and China are going to compete for a manned landing on the moon by 2020 while America is muddling along with no real future space plan. Let's do something significant in space-say, go to Mars by 2020. We could have done it 30 years ago. Planning for a Mars mission was well along. But the nation turned away from space after we landed on the moon, even canceling the three remaining flights to the moon. These Saturn 5 rockets now sit in museums.

The following selections were originally submitted as letters to the editor of newspapers and magazines. Determine which of them can, with good reason, be considered arguments. In those that can, identify the conclusion.