Choose the word whose main stressed syllable is placed differently from that of the others in each group

Choose the word whose main stressed syllable is placed differently from that of the other in each group.
1. A. musician                B. enormous         C. natural              D. improvement
2. A. effective                 B. plentiful           C. dangerous         D. limited
3. A. population              B. education         C. consumption     D. satisfaction
4. A. energy                    B. countryside      C. changeable       D. volunteer
5. A. renewable              B. artificial           C. unfortunate       D. continuous
6. A. different                 B. serious             C. effective           D. regular
7. A. dangerous              B. countryside      C. energy              D. volunteer
8. A. incapable               B. sincere              C. loyalty             D. success
9. A. development          B. satisfaction       C. population        D. education
10. A. interfere               B. convenient       C. referee              D. cigarette
11. A. attraction             B. humorous         C. acquaintance    D. unselfish
12. A. changeable           B. dioxide             C. countryside      D. natural
13. A. important             B. plentiful           C. familiar            D. convenience
14. A. disease                 B. service              C. standard           D. tourist
15. A. agriculture           B. industrial          C. behavior           D. economy