Which one of the following is not a folk song of U.P. ?

The correct answer is (d). Rasia is a folk song of Rajasthan, not Uttar Pradesh.

Birha is a folk song of eastern Uttar Pradesh and Bihar. It is a song of separation and longing, often sung by women who have lost their husbands or lovers.

Dhola Maru is a folk song of Rajasthan. It is a love story about a couple who are separated by their families.

Kajri is a folk song of Uttar Pradesh. It is a song of joy and celebration, often sung during weddings and festivals.