Which of the following statements is correct about the Alvars and the Nayanars? 

a- Alvars and Nayanars sang hymns in Tamil in praise of their Gods
b- They attempted to reform the caste system
c- Bhaktas hailed from diverse social backgrounds. However, untouchables were generally avoided. 
d- They claimed that their compositions were as important as the Vedas.
e- Women were not allowed to become a part of Alvars and Nayanars.

a, b, and d

Correct statement c- Bhaktas hailed from diverse social backgrounds including untouchables.

Correct statement e- Women were also a part of Alvars and Nayanars.