The correct answer is (b) Delhi.
The Commonwealth Games is an international multi-sport event involving athletes from the Commonwealth of Nations. The Games were first held in 1930 in Hamilton, Ontario, Canada, and have been held every four years since then, except for the period during World War II.
The 2010 Commonwealth Games were held in Delhi, India, from 3 to 14 October 2010. The Games were the largest sporting event ever held in India, with over 7,000 athletes from 71 nations competing in 34 sports.
The other options are incorrect because:
(a) Canberra is the capital of Australia. The Commonwealth Games were not held in Canberra in 2010.
(c) London is the capital of England. The Commonwealth Games were not held in London in 2010.
(d) Toronto is the capital of Ontario, Canada. The Commonwealth Games were not held in Toronto in 2010.