Harnessing the Clean, Abundant Energy of the Sun and Wind

Multiple Choice

Harnessing the clean, abundant energy of the sun and wind is critical to solving the global warming problem. Technological advances have brought the cost of electricity generated by the wind down by 82 percent since 1981. Solar energy technology has made remarkable progress as new photovoltaic cells have been developed to convert even greater amounts of sunlight directly into electricity. Today the costs of wind and solar power are becoming competitive with dirty coal-fired plants. Sierra Club, "Global Warming Solutions"

A) Argument; conclusion: Today the costs of wind ... dirty coal-fired plants.
B) Argument; conclusion: Technological advances ... by 82 percent since 1981.
C) Argument; conclusion: Harnessing the clean ... the global warming problem.
D) Nonargument.
E) Argument; conclusion: Solar energy technology ... directly into electricity.