Which of the Following Facilitated the Spread of Brahmanism in South

Which of the following facilitated the spread of Brahmanism in south and Southeast Asia?

A) Sanskrit emerged as a common language of the elites.
B) The Gupta Empire conquered Southeast Asia.
C) The Vedas were translated into the vernacular languages of Southeast Asia.
D) Brahmans abandoned the strict rules of caste in order to appeal to more people.