The correct answer is: B. 2012
Chhota Udaipur district was formed on 26 January 2012, by carving out 10 talukas from Dahod district. The district is named after its headquarters, Chhota Udaipur town. It is located in the eastern part of Gujarat state, and is bordered by Rajasthan state to the north and east, Panchmahal district to the south, and Dahod district to the west. The district has a population of over 1.2 million people, and is predominantly rural. The main languages spoken in the district are Gujarati and Hindi. The district is home to a number of historical and religious sites, including the Chhota Udaipur Fort, the Ambaji Temple, and the Shamlaji Temple.
Option A is incorrect because Chhota Udaipur district was formed in 2012, not 2010.
Option C is incorrect because Chhota Udaipur district was formed in 2012, not 2011.
Option D is incorrect because Chhota Udaipur district was formed in 2012, not 2013.