Why Was Finding Varieties with Reduced Internode Elongation a Key

Why was finding varieties with reduced internode elongation a key step in the breeding of "green revolution" varieties?

A) The resulting reduction in stem biomass allowed the plant to allocate more resources to the grain.
B) Less stem made the plants more palatable to livestock.
C) It reduced the need for the root growth required to support a tall plant.
D) It kept the stems from falling over under the weight of larger seed heads.