Option 1 -> 2010 was too early; the formal bifurcation process had not yet been initiated at the legislative level.
Option 2 -> 2012 saw discussions and deliberations, but the Act was not passed during this year.
Option 3 -> The Andhra Pradesh Reorganisation Act was passed by the Indian Parliament in February 2014, leading to the formation of Telangana as the 29th state of India on June 2, 2014.
Option 4 -> 2016 was after the bifurcation had already been completed and both states were functioning independently.
Hence, Option 3: 2014 -> The Act was passed in February 2014, and Telangana officially came into existence on June 2, 2014, making it India's youngest state at that time -> correct