Question: If in a row of six books, Book A is placed to the left of Book B, and Book C is placed to the right of Book D, which of the following statements is necessarily true?

Options:

1. Book A is to the left of Book D
2. Book B is to the right of Book C
3. Book D is to the left of Book C
4. Book A is to the right of Book C

Correct Answer: Book D is to the left of Book C

Solution:

Since Book C is to the right of Book D, it must be true that Book D is to the left of Book C.