Post your answer in the comments below if you solved it 
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C is the answer
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Only A cannot be produced
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Not correct, good try though 
Correct 
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I had misread the question, I had understood which is the only one that can be produced and not the only one that cannot be produced, you are right, the only one that cannot be produced is A.
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A is the answer
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This kind of question was the hardest for me since I was a student. 
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