An agronomist wants to test three different types of fertilizer (A, B, and C) on the yield of a new variety of wheat. The yield will be measured in bushels per acre. Six 1-acre plots of land were randomly assigned to each of the three fertilizers.

The treatment, experimental unit, and response variable are, respectively,

(a) a specific fertilizer, bushels per acre, a plot of land.

(b) a plot of land, bushels per acre, a specific fertilizer.

(c) random assignment, a plot of land, wheat yield.

(d) a specific fertilizer, a plot of land, wheat yield.

(e) a specific fertilizer, the agronomist, wheat yield.