Explanation

Tracing the physiographic headwaters of these eastern peninsular river systems:

– 2. Nagavali (Correct): Originates in the Eastern Ghats near Lakhbahal in the Kalahandi district of Odisha at an altitude of approximately 1,300 metres.
– 4. Vamsadhara (Correct): Rises in the Eastern Ghats near Thuamul Rampur in Kalahandi district, Odisha, flowing southward into Srikakulam district (Andhra Pradesh) before emptying into the Bay of Bengal.
– 1. Brahmani (Incorrect): Formed by the confluence of the Sankh and South Koel rivers near Rourkela in Odisha; its headwaters originate on the Chota Nagpur Plateau in Jharkhand, not the Eastern Ghats.
– 3. Subarnarekha (Incorrect): Originates near Nagri village on the Ranchi Plateau (Chota Nagpur) in Jharkhand.

Hence, rivers 2 and 4 rise from the Eastern Ghats — Option B.