The correct option is A 35 states and union territories and 6 lakh villages
The Census of 2011 spanned across 28 states, 7 union territories and more than 6 lakh villages in 640 districts. It was the 15th national census and the first one when bio-metric information was collected to issue Unique Identification number to all citizens. The number was issued by Unique Identification Authority of India (UIDAI).