Option 4 : Beas
The correct answer is option 4, i.e. Beas.
River Dolphin is the National Aquatic Animal of India.
Indus river dolphins:
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Origin
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Habitat
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- River.
- The dolphins were forced to adapt to its only remaining habitat rivers as the sea dried up approximately 50 million years ago.
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Inhabitation Region
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- Indus River in Pakistan and River Beas, a tributary of the Indus River in Punjab, India.
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IUCN Status
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- Endangered
- Because the vast inhabitation area has been altered by the irrigation-related projects and construction of dams.
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They rely on echolocation to communicate, navigate and to hunt prey as they are functionally blind as they have adapted to life in the muddy river.