During a book reading session, the following occurred: Reader 1 read before Reader 3, Reader 2 read after Reader 1, and Reader 4 read after Reader 2. What is the correct order of readers?
Answer: A. 1, 2, 3, 4
Reader 1 must read before Reader 2, who reads before Reader 4, and Reader 3 reads after Reader 1, leading to 1, 2, 3, 4.