A significant feature of Indian multilingualism is the dissociation of the language from the script. For instance,

Correct option is C

one may write Urdu using the Devnagari script.
The dissociation of language from script is a unique feature of Indian multilingualism. While Urdu is usually written in the Perso-Arabic script, it can also be written in the Devanagari script, used for writing Hindi. This allows speakers of different languages to write in their language even if they don't know the script traditionally associated with it.