The correct answer is (b), London.
The G20 summit is an annual meeting of the heads of government and finance ministers of the 20 major economies in the world. The first G20 summit was held in 1999 in Berlin, Germany. The G20 summit is hosted by a different country each year. The 2009 G20 summit was held in London, United Kingdom, on April 2-3, 2009. The theme of the 2009 G20 summit was “Leadership to Restore Global Growth and Stability.” The main topics of discussion at the 2009 G20 summit were the global financial crisis, the global economic recession, and climate change.
The other options are incorrect. (a) Geneva is the capital of Switzerland. (c) Paris is the capital of France. (d) Rome is the capital of Italy.