“ I CAN’T ANSWER THIS QUESTION BECAUSE IT IS VERY DIFFICULT.”, SAI...

19. “ I can’t answer this question because it is very difficult.”, said Nam.A.Nam said that he could answer that question because it was not very difficult.B.Nam said that he could not answer that question because it was very difficult.C.Nam said that he cannot answer this question because it was very difficult.D.Nam said that he could not answer that question because it is very difficult.