What fraction of the fossil fuel emissions in the united states could be absorbed by converting 25% of agricultural land in the u. s. to native forests?

The correct answer for the question that is being presented above is this one: "B. Approximately 20 %" The fraction of the fossil fuel emissions in the United States that could be absorbed by converting 25% of agricultural land in the U.S. to native forests is 20%.
Here are the following choices:
A. approximately 10 %
B. Approximately 20 %
C. approximately 30 %
D. Approximately 40 %