Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
The problem was too serious for her to solve by herself.
A.The problem was such serious that she couldn’t solve alone.
B.So serious was the problem that she couldn’t solve it alone.
C.It was such a serious problem that she could solve it alone.
D.She was so serious she couldn’t solve the problem alone.