Ya it is real because we are living in a same planet every thing is linked with each other. it was the great hypothesis of the world one does pollution and all of us have to face it .
I think it’s B too, They were very mean to the natives and stole their land by being violent
Language seems the obvious answer
C. railroad...............
Learned behavior
This is because instinct drives them to eat and find food, but they have to learn that a certain feeder is always out and available
