The correct option is C Gaya
Chaitanya Mahaprabhu was born in Bengal. He popularised the Krishna Cult. He visited Vrindavan to locate the lost holy places associated with Lord Krishna. When he went to Gaya to perform the Shrad ceremony of his departed father, he met Ishavara Puri(his guru). From him, he received initiation with Gopal Krishna Mantra. Here he got enlightenment and told that if we Chant "Hare Krishna" Mantra, We will become pure and enlightened.