Good commentary on word and phrase choice

'Framing' a Story: Journalism 101: Here's the headline on a Wall Street Journal story today about changes in American patterns of electricity demand:

See if you can guess how the lead paragraph of the story ends. It begins this way:

"Americans are using more gadgets, televisions and air conditioners than ever before. But, oddly, their electricity use is barely growing, ..."

Possible choices for the rest of the paragraph are:

(a) "... reflecting hard-won efficiencies in electric-power use by industries and utilities."

(b) "... raising hopes that economic growth can coexist with reduced resource-use and greenhouse-gas emissions."

(c) "... which together with increased shale-gas production may hasten the era of 'energy independence' for the United States."

(d)"... posing a daunting challenge for the nation's utilities."