Why Don't the Countries That Most Need High- Protein Crops

Why don't the countries that most need high- protein crops raise them?

A) High- protein crops are typically low in most other vital nutrients.
B) High- protein crops require extensive irrigation,which may not be affordable to these countries.
C) High- protein crops usually require fertilizers,which may not be affordable to these countries.
D) High- protein crops are more difficult to process,making the foods they produce too expensive.