The decision ( ) how much money should go to education is of

The decision ( ) how much money should go to education is of vital importance.
A、due to
B、owing to
C、as to
D、so as to
【正确答案】：C
【题目解析】：as to 关于，句子含义是教育需要投入多少钱，这个决定至关重要。