The total of the cards are: 9+8+7+6+5+4+3+2+1=459+8+7+6+5+4+3+2+1=45

The total of the cards that can removed 1 card is: (45−1)to(45−9)(45−1)to(45−9)

From this operation and the question, we see only C.54C.54 satisfy these.

So the answer is C

I don't know?