Is It Possible That the Earliest Farmers in Human History

Is it possible that the earliest farmers in human history engaged in genetic engineering?

A) No. They didn't have the technology to do that.
B) No. They had no idea how heredity worked so they wouldn't have known how to change it.
C) Maybe, but only if they tried really hard to create different traits in a domesticated organism.
D) Yes. They would have selected genes in organisms that made those organisms most useful for food.
E) Yes. By selecting organisms with the most useful traits, those traits, and the genes that created them, would increase in the population.