गांधीजींनी मद्रास मध्ये सहा सभा घेतल्या होत्या. त्यांत ________ ना उद्देशून बोलताना गांधीनी त्यांना हातात झाडू व बादली घेऊन मद्रासमधील हरिजन वस्त्या स्वच्छ करण्यास सांगितले.

The correct answer is Option A (Students).

Key Points:
• Gandhiji's Harijan Tour (1933–1934): Following the Poona Pact (1932), Mahatma Gandhi launched a nationwide 9-month Harijan Yatra to crusade against the evil of untouchability.
• Madras Addresses (December 1933): During his visit to Madras, Gandhi addressed multiple large public gatherings, including meetings specifically dedicated to students and youth.
• Appeal to Youth: Addressing university students, Gandhiji urged them to shun caste prejudices, take active responsibility for social sanitation, and "take the broom and the bucket and clean out all the Harijan quarters in Madras".
• Philosophy of Shramdaan: Gandhi consistently advocated dignity of manual labor and practical service for student awakening.
• Target Audience: The appeal was made specifically to students.
• Key Takeaway: During his Madras tour in 1933, Mahatma Gandhi urged students to take up brooms and clean Harijan settlements.