The correct options are
A The earliest form of Malayalam was written in Vattezuthu script.
C By the 14th century books were written in Manipravalam.
Malayalam in the 9th century was incribed in Vattezuthu script. During the 12th century, Ramacharitham was written and is considered as one of the earlier works in Malayalam. In 14th century books were written in Manipravalam, a mixture of Sanskrit and Malayalam.