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Answer 1 is clearly hopelessly unrelated, even if we 'read into it' a compulsion always to revisit the same places ('must') and the dominant presence of the children ('they').
Answer 3 may almost be permissible in certain dialects; at least it catches a sense of the past ('didn't'), but 'us' as a subject is not normal standard English.
Answer 4 has the 'we' correctly, but the present tense is wrong ~ so it doesn't even match the start of the Question.