The correct answer is (b), Sanchi.
Sanchi is a UNESCO World Heritage Site located in Raisen district in the Indian state of Madhya Pradesh. It is a major Buddhist pilgrimage site, as it is home to a group of ancient stupas, monasteries, and temples. The stupas at Sanchi are some of the oldest and finest examples of Buddhist architecture in the world.
However, Sanchi is not connected with any incident of Buddha’s life. The other three options, Sarnath, Kushinagar, and Bodhgaya, are all places where important events in Buddha’s life took place.
Sarnath is the place where Buddha gave his first sermon after his enlightenment. Kushinagar is the place where Buddha died. Bodhgaya is the place where Buddha attained enlightenment.
Sanchi is a beautiful and important site, but it is not connected with any incident of Buddha’s life.