Answer: The answer is B. If he were able to sew, he could have put this button back on the shirt.
Explanation: This sentence contains an untrue clause beginning with if, and that calls for the subjunctive were.
Answer: The answer to this would simply be (B.). I am very good at grammar. I know for a fact the first one would not make any sense. And also c and d are talking in past and future tense. So that does not make sense. Hope this helps. :)
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