The correct answer is: Pherughagh fall is formed by the Subarnarekha river.
The Subarnarekha river is a major river in eastern India. It originates in the Chhotanagpur Plateau in Jharkhand and flows through Odisha and West Bengal before emptying into the Bay of Bengal. The river is about 600 kilometers long and has a drainage basin of about 25,000 square kilometers.
The Pherughagh fall is a waterfall on the Subarnarekha river. It is located in the Mayurbhanj district of Odisha. The waterfall is about 100 meters high and is one of the most popular tourist destinations in Odisha.
The other options are incorrect because they are not rivers that form the Pherughagh fall. The Karo river is a tributary of the Subarnarekha river. The Punpun river is a tributary of the Ganges river. The Sankh river is a tributary of the Brahmani river.