The correct option is D All of these
Travels or Divine Journeys of Guru Nanak Ji called Udasis. During these Udasis(religious tours), he visited holy places of different faith, met people of various faiths, professed his newfound path. He undertook five missionary journeys to the far away places of Ceylon (Sri Lanka), Mecca, Baghdad, Kamroop (Assam), Tibet, Nepal and many more.