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Assiduous (adj.)- showing great care and perseverance. I- usage of the word is correct; the sentence talks about a man who does his work with a lot of effort and care. II- usage is incorrect; one cannot be cold and caring at the same time; if the man was cold or indifferent towards his family, he cannot be called assiduous to their problems. III- usage is incorrect; the sentence here talks about the quality of photographs which cannot be assiduous. Hence, the answer is option b).
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