D. Atacama desert . . . is considered the driest non-polar desert in the world
C. The study of unique traits of different parts of the world
Answer:
Desalination
Explanation:
High salt or Saline water sources are unsafe for human consumption and must have their salts removed I. order to drink.
B is the correct answer. Because A and D are pull factors that bring people in from other places. C is not that crucial and it won't affect the living conditions of a person and that is why B is the correct answer.