The most efficient way to increase essential amino acids in crop ...

[Hungry!]

The most efficient way to increase essential amino acids in crop plants for human consumption would be to
A) breed for higher yield of deficient 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.

[mydiamond]

I know it's A,

Have a wonderful day