Need some help with the following question, thanks!

For the economy shown in Exhibit 1 to operate at point C, it must: C 400 A Cars 300 (millions B per year) 200 D 100 0 100 200 300 400 Grain (millions of tons per year) O experience an increase in its resources and/or an improvement in its technology. O be willing to lower the price of grain. O use its given resources more efficiently than it would at point A. O experience resource unemployment