The best revision of sentence 4 is "Just like homework and other activities, helping to take care of a dog teaches a child about responsibility," option A.
When we make a revision of a sentence, we modify it in order to improve its readability. Therefore, a revision will eliminate contradictions, misspellings, grammatical mistakes, or anything that may hinder the understanding of the sentence.
In sentence 4 we have contradictory information in the sense that the way the sentence has been formulated makes it sound as if having a dog is a bad thing. Therefore, we must choose a revision that makes it clear that owning a dog is good, as it teaches children responsibility.
With that in mind, we can choose option A as the correct answer. This revision clearly states that having a dog, similarly to homework, teaches children to be responsible.
The missing passage containing sentence 4 is the following:
(1) Dogs are great pets for families because they teach children many important life lessons. (2) A dog must be walked and fed at certain times during the day. (3) When a child is in charge of these tasks, he or she learns to be dependable and disciplined. (4) Helping to take care of a dog might interfere with homework or other activities, but it's essential for children to have some responsibility. (5) In addition, dogs are loyal, playful, loving companions.
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