The correct answer is: C. Girnar
The Girnar mountain range is located in the Saurashtra region of Gujarat, India. It is a sacred mountain for Hindus and Jains, and is home to several temples and shrines. The Girnar mountain range was known as Ujjayantagiri in ancient times.
The Aravalli Range is a mountain range located in the northwestern part of India. It is the oldest mountain range in India, and is a major tourist destination. The Aravalli Range was not known as Ujjayantagiri in ancient times.
The Satpura Range is a mountain range located in central India. It is a major watershed, and is home to several national parks and wildlife sanctuaries. The Satpura Range was not known as Ujjayantagiri in ancient times.
The Vindhya Range is a mountain range located in central India. It is a major geographical feature, and is the dividing line between the northern and southern parts of India. The Vindhya Range was not known as Ujjayantagiri in ancient times.