【单选题】Most nearly parallel, in its fundamental approach to the drip system solution described in the passage would be a machine designed to
A．save electricity by converting unused sunlight into power through the use of photocells
B．waste less electricity by insulating and reducing resistance in the conduits of the power grid
C．increase electrical efficiency by requiring consumers to use appliances that rely on less electricity
D．create a more reliable power grid by supplying electricity from a wider range of power plants
E．(E) reduce the electricity necessary to powering a city by encouraging denser population growth
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