Answer : 2. "सतलुज"
Explanation :

Traces of tantalum, a rare metal important in electronics, were found in the Sutlej River by researchers at the Indian Institute of Technology, Punjab. Tantalum is important for capacitors and resistors in devices such as smartphones and laptops. Its discovery indicates untapped mineral wealth beneath the river bed, sparking interest in further exploration. Tantalum's unique properties make it valuable, potentially impacting various industries and the local economy.