The Vital-Vidhvansak, the first monthly journal to have the untouchable people as its target audience was published by

The correct option is Gopal Baba Walangkar.

Explanation:
Gopal Baba Walangkar (also known as Gopal Krishna) was a pioneer of the Dalit movement in Maharashtra, India. In 1888, he started publishing Vital-Vidhvansak (meaning "Destroyer of Ritual Pollution / Untouchability"), which is widely recognized as the first monthly journal specifically targeted at the untouchable people of India. Through this journal, he vehemently criticized the caste system, raised awareness about the social deprivation faced by depressed classes, and challenged the orthodox religious beliefs that justified untouchability.