Concept:Intervisibility exists when two settlements can see each other because no higher land, such as a hill or ridge, lies on the straight line between them.
Explanation:From KUSH, draw imaginary lines of sight toward each settlement on the map.
The routes leading to Oju, Danki, and Musa remain clear of any blocking high ground.
However, the line joining KUSH to Kalu passes across an intervening higher land or ridge.
This rising ground cuts off the view, so KUSH and Kalu cannot see each other.
Hence, Kalu is the only settlement that is not intervisible from KUSH.
Answer:Kalu
