In the question below select the option that best explains the information conveyed in the sentence:

Had Aminu been a dull student, his failure wouldn't have surprised anybody

• A Aminu failed and it surprised everybody since he was dull
• B Aminu was not a dull student and so everybody was surprised that he failed
• C Because Aminu was a dull, student, everybody was surprised that he failed
• D Aminu had been a dull student, and so nobody was surprised that he failed