What Environmental Losses May Have Contributed to the War in Rwanda

What environmental losses may have contributed to the war in Rwanda?

A) Deforestation, overgrazing, and loss of soil all made farming unproductive.
B) Repeated drought conditions made competition for fresh water a factor.
C) Alterations which led to the prevalence of malaria
D) Alterations which led to the prevalence of the disease-causing tsetse flies
E) The main thing was a loss of modern medical care, not so much an ecosystem issue.