The authors imply that the response of various officials to attempts to measure their countries’ carbon stock through field surveys has been

A unhelpful, because they fear that jobs for their countries’ scientists will be lost.
B helpful, because their countries have invested significantly in technology to allow studies to expand.
C helpful, because their countries stand to benefit from universal carbon data that the studies will uncover.
D unhelpful, because they do not make their countries’ land holdings readily available for study.