Concept:The first emergency landing strip for Indian Air Force planes on a National Highway was built in Rajasthan.Explanation:In 2021, Defence Minister Rajnath Singh and Road Transport Minister Nitin Gadkari inaugurated this facility.It is located on the Gandhav–Bhakasar section of NH-925 in Barmer district, Rajasthan.The National Highways Authority of India developed a 3-km stretch of this highway as an emergency landing facility for the IAF.Hence, the state where this first-ever highway emergency landing strip was launched is Rajasthan.Answer:Rajasthan (Option A).