संपूर्ण किंवा जास्तीत जास्त मागासवर्गीय एकाच मतदारसंघात येतील अशी मतदारसंघाची फेररचना करणे, ही शिफारस खालील आयोगाची होती.

The correct answer is Option B ('Mandal Commission').

Key Points:
• Mandal Commission (1979–1980):
• Appointed under Article 340 by the Morarji Desai government under the chairmanship of B.P. Mandal to investigate the conditions of socially and educationally backward classes.
• Apart from recommending 27% reservations in government jobs and public educational institutions, the Mandal Commission recommended radical structural and electoral reforms.
• One notable political recommendation was the reshuffling/delimitation of electoral constituencies in a manner that would cluster backward class populations together to ensure that their demographic weight translated into political representation.
• Evaluation of Other Commissions:
• Shrikrishna Commission: Inquired into the 1992–93 Bombay riots.
• Venkatachaliah Commission (NCRWC, 2000): National Commission to Review the Working of the Constitution.
• Rajamannar Commission (1969): Set up by Tamil Nadu to examine Centre-State relations.
• Key Takeaway: The Mandal Commission recommended re-aligning electoral constituencies to consolidate backward classes into single voting areas.