Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
He is very intelligent. He can solve all the problems in no time.
A.He is so intelligent that he can solve all the problems in no time.
B.Although he is very intelligent, he can solve all the problems in no time.
C.Because he is very intelligent so he can solve all the problems in no time.
D.He is too intelligent that he can solve all the problems in no time.