X and Y Were About to Travel from Jammu Tawi

Multiple Choice

X and Y were about to travel from Jammu Tawi to Delhi by the same train. Y had two tickets for Pathankot and X had a ticket for Delhi. X voluntarily banded over his ticket to Y in order to check that it was right one. Y under the pretence of returning X's ticket substituted it by one of his own and kept X's ticket. What offence did Y Commit?

A) Theft
B) Extortion
C) Misappropriation
D) Cheating.