Question

What would be the best topic sentence for the following paragraph? “_________ People say that there is no evidence, but what you have to do it is keep in mind how big space truly is. NASA has been scanning the skies for years, and even if they searched for another ten thousand years they would have looked at less than one percent of all of space. The fact that so much of space is left unexplored means that we cannot rule out that there could be life somewhere out there. And that does not necessarily mean intelligent life. Something as small as a microorganism might be out there somewhere.

A. People who say that there is no life on other planets are clearly wrong.
B. NASA is taking too long to investigate space.
C. I think it is possible that there is life on other planets.
D. Space is incredibly large.

Answer 1

D. Space is incredibly large.

The best topic sentence for the paragraph would be: "Space is incredibly large." as it introduces the main idea that the vastness of space makes it challenging to conclusively determine the existence of life on other planets.