Explanation
- A
Hundru Waterfall - S u b a r n a r e k h a River
Option (a) claims Hundru Waterfall is located on the Subarnarekha River, which is correctly matched as it sits near Ranchi in Jharkhand on that river.
- B
Chachai Waterfall - Bihad River
Option (b) claims Chachai Waterfall is on the Bihad River, which is a correct pairing found in Rewa district of Madhya Pradesh.
- C
Dhuandhar Waterfall - Narmada River Waterfall
Option (c) claims Dhuandhar Waterfall is associated with the Narmada River, a well-known correct match located in Jabalpur.
- D
Budha Ghagh - Kanchi River
Option (d) claims Budha Ghagh is on the Kanchi River, which is the incorrect pairing making it the key; Budha Ghagh is actually on the North Koel River, while the Kanchi River flows past Dasham Falls.
Summary. Official key is (d) because Budha Ghagh is incorrectly matched with the Kanchi River. The other pairs correctly link Hundru Waterfall to the Subarnarekha River, Chachai Waterfall to the Bihad River, and Dhuandhar Waterfall to the Narmada River. Budha Ghagh is the highest waterfall in Jharkhand and is situated on the North Koel River tributary. Aspirants must carefully distinguish between the river associations of various waterfalls in the Chota Nagpur plateau to avoid such errors.