If the Total Global Production of Grains Cannot Be Significantly

If the total global production of grains cannot be significantly increased in the next 50 years,and the human population continues to increase,one strategy to feed people would be to____________ .

A) increase our use of fossil fuels in agriculture
B) greatly reduce the amount of meat in our diets
C) increasingly rely on fungi for nutritional needs
D) engineer plants that can grow without sunlight