The correct options are
A A temple entry movement called Vaikom movement.
B The idea of one caste, one religion, and one god.
C He started Dharma Paripalana Yogam.
One Caste, One Religion and One God for human beings was the basic idea of Sri Narayana Guru. He believed that education is the only path to achieve this. He built temples for the backward communities as they were denied entry into temples. Narayana Guru and his companions started ‘Viakom Movement’ - a temple-entry movement. Gandhiji and Periyar took part in movement after this.