1. c 2. c 3. b 4. d 5. b 6. c 7. c 8. a 9. d 10. a 11. a 12. c 13. c 14. a 15. d 16. c 17. c 18. d 19. b You need the relevant graph to answer questions 20 through 26 20. c 21. d 22. c 23. c 24. c 25. c 26. c Please check the answers. Once in a while there will be typos.