Mahabodhi Temple has been built at Bodh Gaya where-

Correct answer: (b) Gautama Buddha received enlightenment

Explanation

At Bodh Gaya, after six years of penance, Buddha attained enlightenment at the age of 35 on the night of Vaishakh Purnima under a peepal tree. Construction of the temple at this site was started by Emperor Ashoka in the third century BCE; however, its present form was built in the 5th–6th century CE. This temple is entirely made of bricks. In 2002, UNESCO included it in the list of World Heritage Sites.