Plant Breeding Remains One of the Most Promising Means of Increasing

Plant breeding remains one of the most promising means of increasing yields, even with progress in genetic engineering, because genetic engineering

A) works on very few plant varieties while breeding works with all plants.
B) involves those genes that have small effects while breeding involves genes with large effects.
C) improves plants by reducing the requirement for pollinators.
D) works on single genes while breeding involves many genes, often including some not yet identified.