1. B. release
The words in options A, C, and D have /ʊ/ sound, while option B release has /iː/ sound.
2. C. harmful
The words in options A, B, and D have /ʊ/ sound, while option C harmful has /ɑː/ sound.
3. D. pick
The words in options A, B, and C have /ɪ/ sound, while option D pick has /ɪ/ but it is pronounced as a single syllable, while others are bisyllable, but the most differing is "wild" which is pronounced as /aɪ/, so this answer is not very clear, but I'll give it to "pick".
4. B. market
The words in options A, C, and D have /ɑː/ sound, while option B market has /ɑr/ sound.
5. A. return
The words in options B, C, and D have /ʊ/ sound, while option A return has /ʌ/ sound and the others start with a consonant.
6. D. circles
The words in options A, B, and C have the main stress on the second syllable, while option D circles has the main stress on the first syllable.
7. A. violent
The words in options B, C, and D have /aɪ/ sound, while option A violent has /aɪə/ sound.
8. D. verbal
The words in options A, B, and C have /ɛ/ sound, while option D verbal has /vərbəl/ sound and the others don't.
9. C. connection
The words in options A, B, and D have /kəm/ sound, while option C connection has /kə/ sound.
10. A. cyber
The words in options B, C, and D have /aɪ/ sound, while option A cyber has /aɪbər/ sound but the start is different.