With the Kyoto Protocol, commitments were made not to actions but to results that were to be measured after a decade or more. This approach has several disadvantages. An obvious one is that it is difficult determine, until close to the target date, which nations are on course to meet their goals. Based on the context, what is the given information, A, B, C, or D?
A、the Kyoto Protocol
B、after a decade of more
C、this approach
D、the target date