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The correct answer is option 3, Tomb of Sultan Balban.
Option 1, Arhai din ka Jhonpra, is not the correct answer because it is a medieval mosque in Ajmer, Rajasthan, India, but it does not have the first extant true arch.
Option 2, Quwwat ul Islam Mosque, is not the correct answer because although it is one of the oldest mosques in India, it does not have the first extant true arch.
Option 4, Alai Darwaza, is not the correct answer because it is a gateway to the Qutub Complex in Delhi, India, and while it does have beautiful arches, it is not the first extant true arch.
The Tomb of Sultan Balban, located in Mehrauli, Delhi, India, is the correct answer because it is the earliest example of a true arch in India. It was built in the 14th century and features a pointed arch, which is characteristic of true arches. The tomb is known for its architectural significance and marks the beginning of the true arch tradition in India.