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To answer the question, we need to analyze the pronunciation of each word and find the one that has the underlined part pronounced differently. 1. a. tofu, b. opera, c. hot, d. bottle The underlined part is the "ot" or "o" sound. - tofu: ˈtoʊfu (oʊ sound) - opera: ˈɑprə (ɑ sound) - hot: hɑt (ɑ sound) - bottle: ˈbɑtəl (ɑ sound) The answer is a. tofu. 2. a. taught, b. water, c. sandwich, d. author The underlined part is the "au" sound. - taught: tɔt (ɔ sound) - water: ˈwɔtər (ɔ sound) - sandwich: ˈsænwɪʧ (æ sound) - author: ˈɔθər (ɔ sound) The answer is c. sandwich. 3. a. apple, b. pancake, c. snack, d. salt The underlined part is the "a" sound. - apple: ˈæpəl (æ sound) - pancake: ˈpænkeɪk (æ sound) - snack: snæk (æ sound) - salt: sɔlt (ɔ sound) The answer is d. salt. 4. a. sauce, b. saw, c. bought, d. yoghurt The underlined part is the "au" sound. - sauce: sɔs (ɔ sound) - saw: sɔ (ɔ sound) - bought: bɔt (ɔ sound) - yoghurt: * (no IPA notation provided, but typically /jəˈɡɜːrt/ or /joʊˈɡɜːrt/, with the "au" sound) However, without the IPA notation for yoghurt, we can only analyze the other three options. All the options a, b, and c have the "au" sound pronounced the same way. Therefore, we cannot determine the answer to this question with certainty. 5. a. torch, b. pot, c. omelette, d. rock The underlined part is the "or" sound. - torch: tɔrʧ (ɔ sound) - pot: pɑt (ɑ sound) - omelette: * (no IPA notation provided) - rock: rɑk (ɑ sound) The answer is a. torch, but it is also possible that the answer is c. omelette or b. pot or d. rock.