The correct answer is: C. Ujjain.
Sumtinath Tirthankar was the 16th Tirthankar of Jainism. He was born in Ayodhya, but he received Shiksha (enlightenment) in Ujjain. After his enlightenment, he traveled throughout India, teaching his followers about the path to liberation. He is said to have died in Sammet Shikhar, a mountain in Gujarat.
Ayodhya is a city in Uttar Pradesh, India. It is considered to be one of the seven most sacred cities in Hinduism. Ayodhya is the birthplace of Lord Rama, one of the most important figures in Hinduism.
Nashik is a city in Maharashtra, India. It is one of the most important pilgrimage sites for Hindus. Nasik is home to the Kumbh Mela, one of the largest religious gatherings in the world.
Ujjain is a city in Madhya Pradesh, India. It is one of the seven most sacred cities in Hinduism. Ujjain is home to the Mahakaleshwar Temple, one of the most important temples in Hinduism.
Kishkindha is a forest kingdom in the Indian epic Ramayana. It is ruled by the monkey king Sugriva. Kishkindha is located in the present-day state of Karnataka.