The correct answer is (a) Lucknow.
The construction work of the international cricket stadium in Lucknow was started in October 2014. The stadium is being built on a 63-acre land in the Indira Gandhi Pratishthan (IGP) complex in Lucknow. The stadium will have a seating capacity of 50,000 people and will be equipped with all the modern facilities. It is expected to be completed by 2016.
The stadium will be used for international cricket matches and will also be a venue for other sports events. It is expected to boost the tourism industry in Lucknow and will also provide employment opportunities to the local people.
The other options are incorrect because the construction work of an international cricket stadium has not started in any of these cities.
(b) Varanasi: The construction work of an international cricket stadium in Varanasi has not started.
(c) Noida: The construction work of an international cricket stadium in Noida has not started.
(d) Agra: The construction work of an international cricket stadium in Agra has not started.