The correct options are
A In 1956, Sinhala was made the official language of Sri Lanka.
C Buddhism was made the official religion of Sri Lanka.
In 1956, Sinhala was made the official language of Sri Lanka. Following this, there were a series of laws that favoured the Sinhalese. For instance, laws were passed that favoured Sinhalese applicants for university positions and government jobs. Buddhism, the religion followed predominantly by the Sinhalese, was made the official religion of Sri Lanka.