Rick owns a farm, which produces many different crops, including wheat. The table shows the relationship between the number of acres, a, and the bushels of wheat, w, the farm produces. Based on this information, which is the independent variable and the dependent variable?
A) Both acres and wheat are dependent variables.
B) Both acres and wheat are independent variables.
C) The dependent variable is wheat, and the independent variable is acres.
D) The independent variable is wheat, and the dependent variable is acres.