Concept:Intervisibility between two points is blocked when a high ridge, hill, or steep slope lies between them.Explanation:From Agubia, check the contour pattern toward each listed town.Nsuba is separated from Agubia by contour lines that show a steep slope or intervening high ground.This raised land blocks a direct line of sight between the two locations.Hence, Agubia and Nsuba are not intervisible.The other towns do not have such an obstruction on the line of sight.Answer:B. Nsuba
