The correct answer is C) World grain production has generally increased between 1950 and 2010.
The statement about this graph that is accurate is that "World grain production has generally increased between 1950 and 2010."
According to the data presented, we can conclude that since the Green Revolution that started in México in 1944, other countries followed this technique that allowed them to increase the production of grain since 1950. The Green Revolution of México consisted of the development of new plants and fruits and the modification of agricultural techniques to increase food production.