Answer: C) "During the past twenty-five years, electricity supplies have been extended to 1.3 billion people living in developing countries. Yet despite these advances, roughly 1.6 billion people, which is one quarter of the global population, still have no access to electricity and some 2.4 billion people rely on traditional biomass, including wood, agricultural residues and dung, for cooking and heating. More than 99 percent of people without electricity live in developing regions, and four out of five live in rural areas of South Asia and sub-Saharan Africa "

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Source: Rice University