The Most Efficient Way to Increase Essential Amino Acids in Crop

Multiple Choice

The most efficient way to increase essential amino acids in crop plants for human consumption would be to ________.

A) select for higher yield of the desired amino acids
B) increase the amount of fertilizer used on fields
C) use 20-20-20 fertilizer instead of 20-5-5 fertilizer
D) engineer nitrogen-fixing nodules into crop plants lacking them
E) increase irrigation of nitrogen-fixing crops