[单项选择]" The utilities are more interested in protecting their stranglehold on the power grid and preserving their century-old business model than they are producing clean electricity," says Jim Harvey, who heads up the Joshua Tree, Calif. — based Alliance for Responsible Energy Policy, an advocacy group that’s staunchly opposed to utility-generated solar power. Harvey actually believes that the country’s entire renewable portfolio can be achieved through rooftop solar alone. That may be possible from a sheer megawatts perspective, but from a practical standpoint, it’s way over— ambitious. With no centralized source, how do you run traffic or street lights What if it rains for a week We still don’t have foolproof means to store solar power, so for how, distributed generation needs the grid as a backup.
What does the author think of Harvey’s idea of achieving the country’s entire renewable portfolio through rooftop solar alone
A. It is possible.
B. It is not practical.
C. It is out of question.
D. It takes time to se

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