The correct answer is (b).
Chinese President Xi Jinping first went to Delhi during his visit to India in September 2014. He met with Indian Prime Minister Narendra Modi and discussed a number of issues, including trade, investment, and security. The two leaders also signed a number of agreements, including a memorandum of understanding on cooperation in the field of nuclear energy.
Option (a), Ahmedabad, is the capital of the Indian state of Gujarat. Option (c), Kolkata, is the capital of the Indian state of West Bengal. Option (d), Bengaluru, is the capital of the Indian state of Karnataka.