Wheat was one of the first plant crops that humans domesticated. In the process of domestication, the wild form of wheat was eventually changed into a form more suited for human agriculture. Early farmer most likely used seeds only from wheat plants with--

A-larger grains that could produce more food per plant.
B-taller stems that could block sunlight from weeds growing at ground level.
C-larger flowers that could be sold for additional income.
D-thinner stems that could endure heavy winds.