单选题 The author uses the example of the question of life in other galaxies primarily in order to

• (A) question whether in certain situations the truth may ever be determined
• (B) illustrate that truth has an objective existence even when there are few empirical grounds for determining it
• (C) suggest that the answer to certain scientific questions plays only a minor role in people's lives
• (D) support the thesis that skepticism plays a vital role in the scientific process
• (E) assess the answers pseudo-sciences like ufology provide for unanswerable questions