Which events in and after the 1960s contributed significantly to the decentralization of England from London to a more regional focus, ultimately also making way for a less homogenous vision of England and the popularity of postcolonial fiction ?

A. Radio announcers were permitted to speak in regional dialects and multicultural accents.

B. The Arts Council designated many of its resources to supporting regional arts councils.

C. Regional radio and television stations appeared throughout the country.

D. all of the above