छ. राजर्षि शाहू महाराजांनी 1917 साली ____ येथे अखिल भारतीय बहिष्कृत समाज परिषद भरविली होती.

The correct answer is Option C (कोल्हापूर संस्थान).

Key Points:
• The key concept is the social reform efforts of Chhatrapati Shahu Maharaj for the depressed classes.
• Shahu Maharaj actively organized and supported conferences for the upliftment of the untouchables. The official answer key credits him with organizing a Depressed Classes (Bahishkrut Samaj) conference in his own Kolhapur State around 1917 to encourage social assimilation.
• Although there were other major conferences (like Mangaon in 1920), for the specific year 1917 mentioned in the prompt, Kolhapur Sansthan is marked as the correct answer.
• Key Takeaway: In 1917, an Akhil Bharatiya Bahishkrut Samaj Parishad event associated with Shahu Maharaj was held in the Kolhapur State.