In the last 50 years, the greatest progress in addressing worldwide hunger and malnutrition came from the

In the last 50 years, the greatest progress in addressing worldwide hunger and malnutrition came from the:

1. A) use of better transportation methods to export grain more efficiently
2. B) development and use of new varieties of high-yielding wheat and rice
3. C) reduced reliance on pesticides, herbicides, and chemical fertilizers
4. D) widespread use of sustainable irrigation methods