Answer Key for Book A Answer Key for Book B
Answer Key for Book C Answer Key for Book D
The fine print: Many of these questions have multiple correct answers, and the incidence of this increases throughout the course. In all cases, the answer key shows one answer as it would be quite impossible to create a comprehensive set of answers to these questions. You will need to think about what the answers are saying, and in nearly every case, there will be benefit in comparing answers with other students and having a debate/discussion.
Answer Keys for all the questions in the books are also at these freely accessible web sites maintained by the printer. They are not available in hard copy or in any other format.