Explanation:

During social reform movements, with increasing opportunities of education and general awakening, there were stirrings among the lower castes themselves. This awakening gradually developed into a powerful movement in defence of their rights and against upper-caste oppression.
Pair 1 is correctly matched. Gopal Baba Walangkar is considered to be a pioneer in the movement to uplift the untouchable people from the socio-economic oppression that they had been subject to for ages. Walangkar launched a newspaper, the Vital Vidhvanasak (Destroyer of Brahmanical or Ceremonial Pollution).
Pair 2 is incorrectly matched. In the 1920s, Babasaheb Ambedkar started a fortnightly newspaper, Mooknayak (Leader of the Voiceless) in 1920. He stated in the Mooknayak that a nationalist consciousness could not develop if social divisions were ignored. The newspaper presented the sufferings of the untouchables in the context of the caste system.
Pair 3 is incorrectly matched. Babasaheb Ambedkar formed the Bahushkrit Hitakarani Sabha in 1924 with the focus being on mobilising the masses. It marked the beginning of a new socio-economic and political movement striving to bring about equality for the oppressed classes. Another newspaper he started with the aim of defending the rights of the depressed classes was Bahishkrit Bharat (1927).