Read this partial summary of Passage 1.It has been known since ancient times that people behave oddly when the moon is full. The
moon's gravity may be the cause.Which sentence could be added to complete the
summary?

The full moon causes dogs to bite people more
often.

This effect is the reason extra police officers may
be needed

Modern studies now confirm a lunar effect on
human behavior.

Four out of five mental health professionals could
not be wrong

Contrary to popular belief, Africa's civil wars are not due to its ethnic and religious diversity. Using recently developed models of the overall prevalence of civil wars in 161 countries between 1960-1999, we draw lessons with special reference to Africa, showing that the relatively higher prevalence of war in Africa is not due to the ethno-linguistic fragmentation of its countries, but rather to high levels of poverty, failed political institutions, and economic dependence on natural resources. We argue that the best and fastest strategy to reduce the prevalence of civil war in Africa and prevent future civil wars is to institute democratic reforms that effectively manage the challenges facing Africa's diverse societies.