Explanation:

Malihabad, a town situated near Lucknow in Uttar Pradesh, is widely acclaimed as the 'Mango Capital of India'. This region is particularly famous for its vast mango orchards and the cultivation of numerous mango varieties, most notably the exquisite Dasheri mango. Option (1) Prayagraj, (2) Moradabad, and (4) Bareilly are important cities in Uttar Pradesh but are not known by the specific epithet of 'Mango Capital of India'. Their agricultural or industrial specializations lie elsewhere. Therefore, Malihabad is the correct answer due to its unparalleled mango production.