Explanation:

The most spoken regional language/Boli in the Uttar Pradesh is Bhojpuri. Khadi language/Boli is spoken in areas like East Delhi, Meerut, Bagpat, Mujjafar Nagar, Ghaziabad, Gautam Buddha Nagar etc. Awadhi language/Boli is spoken in areas like Faizabad, Gonda, Shravasti, Lucknow, Amethi, Allahabad etc. Mathura, Aligarh, Agra, Firozabad, Bareilly etc. are the area of Braj language/Boli. Kannauji language/Boli is spoken in Kannauj, Etawah, Auraya, Kanpur etc. Kannauj language and Braj languages share many similarities. Bundeli langauge/ boli is spoken in Jhansi, Lalitpur, Hamirpur, Chitrakoot etc. Bagheli is the least spoken language/ boli in Uttar Pradesh.