The correct answer is: b) Ministry of Road Transport & Highways.
The Ministry of Road Transport & Highways is the nodal ministry of the Government of India responsible for the development and maintenance of national highways, state highways, and major district roads. It also oversees the operations of State Transport Undertakings (STUs) like GSRTC.
The Ministry of Railways is responsible for the development and maintenance of the Indian Railways, the largest railway network in Asia. The Ministry of Civil Aviation is responsible for the development and maintenance of civil aviation infrastructure in India. The Ministry of Shipping is responsible for the development and maintenance of the Indian shipping industry.
STUs are government-owned companies that provide public transportation services in India. They are responsible for the operation of buses, taxis, and other modes of public transportation. The Ministry of Road Transport & Highways oversees the operations of STUs to ensure that they provide safe and efficient public transportation services.