Which one of the following statements is correct?
(a) Ajanta Caves lie in the gorge of Waghora river.
(b) Sanchi Stupa lies in the gorge of Chambal river.
(c) Pandu-lena Cave Shrines lie in the gorge of Narmada River.
(d) Amaravati Stupa lies in the gorge of Godavari river.