The correct options are
B Sangam poems revolve mainly around two themes: love and warfare.
C Tolkappiyam is the oldest work that has survived from the Sangam Age.
D It is largely silent on religious practices.
The Tamil language is an important language is Indian language pantheon. It is relatively free from influences of Sanskrit and its derivative languages. Sangam literature is talks about human aspects like love, sexuality, ethics, philanthropy, customs, social life, and warfare. Unlike early Indian literature, it is not religious in nature. The oldest work that has survived from the Sangam Age is Tolkappiyam, a work on Tamil grammar. Silappadikaram and Manimeghalai are the latest works of ancient Tamil literature.