Sure, let's go through each group and identify the word whose underlined part is pronounced differently from the others:

1. **C. finishes** - The "es" in "finishes" is pronounced /ɪz/, while in "leaves," "arrives," and "goes," the "es" is pronounced /z/.
2. **A. bread** - The "ea" in "bread" is pronounced /ɛ/, while in "clean," "meal," and "tea," the "ea" is pronounced /iː/.
3. **B. post** - The "o" in "post" is pronounced /oʊ/, while in "orange," "body," and "copy," the "o" is pronounced /ɒ/ or /ɑː/.
4. **A. weak** - The "ea" in "weak" is pronounced /iː/, while in "head," "heavy," and "breakfast," the "ea" is pronounced /ɛ/.
5. **B. table** - The "a" in "table" is pronounced /eɪ/, while in "lamp," "family," and "bag," the "a" is pronounced /æ/.
6. **A. citadel** - The "a" in "citadel" is pronounced /æ/, while in "vacation," "destination," and "lemonade," the "a" is pronounced /eɪ/.
7. **A. teachers** - The "s" in "teachers" is pronounced /z/, while in "doctors," "students," and "workers," the "s" is pronounced /s/.
8. **A. accident** - The "cc" in "accident" is pronounced /ks/, while in "soccer," "clinic," and "camera," the "c" is pronounced /k/.
9. **B. weather** - The "th" in "weather" is pronounced /ð/, while in "mouth," "thick," and "throw," the "th" is pronounced /θ/.
10. **A. language** - The "e" in "language" is silent, while in "engineer," "sausage," and "jogging," the "e" is pronounced /ɪ/ or /ə/.

I hope this helps! Let me know if you have any further questions.