विश्व का सर्वाधिक उर्जा कुशल शहर कौन सा है? A. वैंकूवर B. रेकजाविक C. डेनमार्क D. मालमो

Reykjavik, Iceland's capital, runs almost entirely on renewable geothermal and hydro power and was rated the most energy-efficient city, as per the official key. (Denmark is a country, not a city.)