Respuesta :

Answer:

  • B. It is happening today in the united states and europe.
  • C. its happening today in most developing nations.
  • D. Occured in the U.S and europe in the 19th century.

Explanation:

  • The demographic transition the movement of the population from a high birth and high death rate to low birth and low death rate of population growth.  
  • It began in the 19th century in the economically developed nations of the world.  
  • A large reduction in birth rates was followed by the early 20th century.  
  • The developing nations of the world are having large-scale population growth while the developed are declining.