Detailed Explanation:

Answer: Option 3 — an anti-caste movement in Maharashtra

Satya Shodhak Samaj (Society of Truth Seekers) was founded by Jyotirao Phule in Pune, Maharashtra, on 24 September 1873. Its primary objective was to liberate the lower castes—Shudras, Dalits, and women—from Brahmanical domination and social exploitation. Phule challenged the caste system through his writings, notably 'Gulamgiri' (Slavery), and established institutions for the education of women and depressed classes. His wife Savitribai Phule led the women's section of the Samaj. The movement was distinctly an anti-caste reform initiative in Maharashtra, not related to tribal upliftment in Bihar, temple-entry in Gujarat, or peasant movements in Punjab.