Ashoka, the Mauryan emperor, inscribed his edicts on rocks and pillars across the empire, spreading his messages of morality, dharma, and governance. These inscriptions were written in multiple languages to ensure a broader audience could understand and comprehend the principles laid out by Ashoka. The two primary languages used in these inscriptions were Prakrit, the common vernacular language of the region, and Greek.

Prakrit was chosen to communicate with the majority of the Indian population, making the edicts accessible to a wide audience. Additionally, Greek was used to cater to the Hellenistic communities in the northwest of the Mauryan Empire, acknowledging the cultural and linguistic diversity within the vast territories under Ashoka's rule.

So, the correct option is [1].