6. The title of this text is "Why Do Cave Fish Lose Their Eyes?" Why might the author have written the title as a question?
A. to encourage readers to answer the question on their own before they read the article
B. to prepare readers for a discussion of possible answers to this question in the article
C. to criticize scientists for not having reached a definite answer about why cave fishes
lose their eyes
D. to praise scientists for the effort they have put into understanding the cause of
blindness in cave fishes