The correct options are
A Challenging the Varna system.
C Uplifting of discriminated people
D Rejecting traditional religious thoughts.
Lokayat rejected traditional religious thoughts. They challenged the authority of the Vedas, as well as the authority of the Brahman priests. This in turn led to the setting up of religions which opposed any sort of descrimination on the basis of caste that would hinder the upliftment of an individual.