SO GUYS I HAVE A QUESTION The graph below shows grain production in a village in Africa over a 40-year period.

Over the years, land used for grain production in this village has been subjected to aggressive farming practices such as over-watering and plowing. How have these activities most likely affected the land?
A.
The total volume of soil has increased.
B.
The fertility of the soil has increased.
C.
The rate of soil erosion has increased.
D.
The rate of soil formation has increased.