An editor is compiling a textbook containing essays by several different authors. The book will contain essays by Lind, Knight, or Jones, but it will not contain essays by all three. If the textbook contains an essay by Knight, then it will also contain an essay by Jones.

Question: If the statements above are true, which one of the following must be true?
Options:
A. If the textbook contains an essay by Lind, then it will not contain an essay by Knight.
B. The textbook will contain an essay by only one of Lind, Knight, and Jones.
C. The textbook will not contain an essay by Knight.
D. If the textbook contains an essay by Lind, then it will also contain an essay by Jones.
E. The textbook will contain an essay by Lind.
Answer: "A"