Choose the word whose the underlined part is pronounced differently from the other three

I. Choose the word whose the underlined part is pronounced differently from the other three.
1. A. designer B. prefer C. because D. mention
2. A. generation B. garbage C. energy D. college
3. A. could B. amount C. shout D. proud
4. A. stopped B. matched C. worked D. provided
5. A. books B. clubs C. hats D. stamps