The Ambubachi Mela is a major Hindu festival celebrated at:

Kamakhya Temple
Umananda Temple
Navagraha Temple
Mahabhairav Temple

The correct answer is: a) Kamakhya Temple.

The Ambubachi Mela is a major Hindu festival celebrated at the Kamakhya Temple in Guwahati, Assam, India. The festival is held annually for three days in the month of June or July, and is dedicated to the goddess Shakti. The festival is a major pilgrimage for Hindus from all over India, and attracts thousands of visitors each year.

The Kamakhya Temple is one of the most important Shakti Peethas, or sacred sites of Shakti, in India. The temple is located on the Nilachal Hill, overlooking the Brahmaputra River. The temple is dedicated to the goddess Shakti, who is worshipped in the form of a yoni, or vulva. The yoni is said to be the source of all life, and the festival celebrates the power of Shakti to create and destroy.

The Ambubachi Mela is a time of great spiritual significance for Hindus. The festival is a time to pray for blessings from the goddess Shakti, and to seek her protection from evil. The festival is also a time to celebrate the power of women, and to honor the role that they play in society.

The Ambubachi Mela is a colorful and vibrant festival. The streets of Guwahati are decorated with flowers and banners, and the air is filled with the sound of music and dancing. The festival is a time for Hindus to come together and celebrate their faith.

The Ambubachi Mela is a unique and unforgettable experience. If you have the opportunity to attend the festival, I highly recommend it. It is a time to experience the power of Shakti, and to celebrate the beauty of Hinduism.

The other options are incorrect because they are not temples dedicated to the goddess Shakti. The Umananda Temple is a Hindu temple dedicated to the god Shiva. The Navagraha Temple is a Hindu temple dedicated to the nine planets. The Mahabhairav Temple is a Hindu temple dedicated to the god Bhairava.