In what way do the interconnections among the people of the nations of the world today differ from ...

In what way do the interconnections among the people of the nations of the world today differ from interconnections of 50 years ago?
 
  a. The division of economic activities between nations and regions has changed.
  b. Cultural exchange is much more one-sided today due to the relatively greater power of Western countriescompared with others.
 c. Today the interconnections are between entire continents; in the past interconnections were only local.
  d. All of these are ways that global interconnections today differ from those of the past.