Answer:
"C. I tell you the New Frontier is here, whether we seek it or not. Beyond that frontier are the uncharted areas of science and space..."
Note the usage of "uncharted areas of.... space", assumingly meaning that beyond the world, or otherworldly, which implies outer space and beyond.
"A. schools are overcrowded..."
Note the quote:
"A urban population explosion has crowded our schools...", which implies that A is the correct answer.