Here are the answers identifying the words with a different stress pattern for each item:

1. **A. addict** (other words have stress on the second syllable)
2. **C. competitive** (other words have stress on the first syllable)
3. **B. decision** (other words have stress on the second syllable)
4. **B. melody** (other words have stress on the first syllable)
5. **C. puzzle** (other words have stress on the first syllable)
6. **C. relax** (other words have stress on the first syllable)
7. **B. total** (other words have stress on the first syllable)
8. **C. pronounce** (other words have stress on the second syllable)
9. **A. affect** (other words have stress on the second syllable)
10. **C. prefer** (other words have stress on the second syllable)

Feel free to ask if you need clarification on any of these!