Choose the word whose the underlined part is pronounced differently from the other's

1. Choose the word whose the underlined part is pronounced differently from the other's. Circle A, B or C.
 
1. A. this
B. though
C. health
 2. A. mother
B. cloth
C. within
 3. A. feather
B. theatre
C. earth
 4. A. weatherman
B. Thanksgiving
C. neither
 5. A. bathroom
B. cathedral
C. another