Option c is the correct answer. Kalsi, a town is located in Dehradun District of Uttarakhand is famous for the Rock edicts of Ashoka. The Kalsi rock contains a series of major inscriptions known as the Rock edicts of Kalsi. Among them, Rock Edict No. 13 of Ashoka is particularly notable as it mentions the names of Greek kings such as Antiochus, Ptolemy, Antigonus, Magas, and Alexander, who received Ashoka's teachings.