ACompetition for water and nutrients and for solar energyOption A
BFuture agroforestry systems will have to overcome physiological (canopy structure) biological (pests and disease), ecological (Sustainability and environment protection) constraints besides being economically soundOption B
AAgroforestry appears as an interesting contribution to solve the food crisis as well as the energy crisis.Option A
BAgroforestry has been under-estimated and it seems that the shortage will soon attain an even more critical level in the Third World than the shortage of alimentsOption B