The correct answer is (c) 1916.
The Lucknow Pact was a political agreement between the Indian National Congress and the All-India Muslim League, signed on 26 December 1916, in Lucknow, British India. The pact was an attempt to resolve the differences between the two parties and to unite them in their struggle for Indian independence.
The pact agreed on a number of important issues, including separate electorates for Muslims, a system of weightage for Muslims in the legislatures, and the recognition of Urdu as a national language. The pact was a significant step forward in the Indian independence movement, and it helped to pave the way for the formation of the All-India Congress Committee (AICC) in 1920.
The other options are incorrect. Option (a) is incorrect because the Lucknow Pact was not signed in 1912. Option (b) is incorrect because the Lucknow Pact was not signed in 1914. Option (d) is incorrect because the Lucknow Pact was not signed in 1918.