The correct answer is D. Rapid population growth
Step-by-step explanation:
The term "Green Revolution" refers to a set of different strategies and initiatives that have been implemented since 1950 to increase agricultural production all around the globe with the propose of ending with starvation, especially in developing countries. The "Green Revolution" implied the use of new technologies, fertilizers, water supply systems and methods of fertilization that improved the agriculture massively and guaranteed the production of food for all the population, these strategies were implemented successfully in some countries such as India and Mexico, but failed in Africa due to corruption, lack of infrastructure and other issues.
Additionally, to this, the Green Revolution continues nowadays, not only because starvation has not ended, but because in the last century the population all around the world has been growing massively and it is necessary to increase the production of food in the same way. Considering this, it can be concluded the global issue that made the Green Revolution necessary was the rapid population growth as this issue made necessary the implementation of new agricultural methods and technologies to produce enough food for all the population.