Choose the closest paraphrased version after the following sentence or the italicized part.
Sometimes I think how grateful I would be today if I had learned more back then about what really matters.（ ）
A.正确答案BI would be happy now if I had learned more about great historic events.
B.I would be satisfied today if I had learned more about things really important.
C.Since I have learned how to deal with difficulties, I feel content with my education.
D.Since I have learned more than other students, I feel thankful to my school teachers.
