When and where Panchayati Raj system in India was introduced?

• A. July5, 1957; Firozabad (U.P)
• B. October 2, 1959; Nagor (Rajasthan)
• C. Nov 14, (1959; Ahmedabad (Gujrat)
• D. December 3, 1960; Bhopal (M.P)