Choose the word whose underlined part is pronounced differently from the others

Here are the words from the list with underlined parts that are pronounced differently:

1. **C. birth** (the "ir" sound is different from the others)
2. **A. surfing** (the "ur" sound is different from the others)
3. **A. mother** (the "o" sound is different from the others)
4. **C. flooded** (the "oo" sound is different from the others)
5. **A. saved** (the "a" sound is different from the others)
6. **C. volunteered** (the "e" sound is different from the others)
7. **C. followed** (the "o" sound is different from the others)
8. **C. knives** (the "i" sound is different from the others)
9. **D. leaf** (the "ea" sound is different from the others)
10. **D. vitamin** (here, the first vowel sound is different from the others)

So the answers are:
1. C, 2. A, 3. A, 4. C, 5. A, 6. C, 7. C, 8. C, 9. D, 10. D.