What factors led to the beginning of world war ii in europe?
a. various independence movements in serbia against austria-hungary
b. the rise of aggressive nationalism among some of the nations defeated in world war i
c. the rise of communism in soviet russia, which was seen as a threat by many european nations
d. rising competition among european powers for colonies and trading posts in africa and asia

you can pick multiple

B. the rise of aggressive nationalism among some of the nations defeated in World War I B. the rise of aggressive nationalism among some of the nations defeated in World War I.  Germans suffered under a bad economy where one of the causes was the massive reparations that they had to pay.  Feelings of resentment grew among the citizens and Adolf Hitler used that to fuel an aggressive form of nationalism that would let to military build-up and eventually led to WW II.

with? ?

explanation:

in ray bradbury's short story "a sound of thunder", mr. eckels's fearfulness leads to drastic consequences for the rest of the world.

in the story, mr. eckels, who is a hunter, hires a time travel company to travel to the age of dinosaurs. although he is excited for the hunting expedition at the beginning, when they reach there and mr. eckels sees the tyrannosaurus, he feels frightened. as he is afraid of the tyrannosaurus, he steps off the path although he has been warned not to do it. by stepping off the path, the entire course of the future is affected: mr. eckart alters the future by stepping on a butterfly, which causes a new man to be elected president in the future. in that way, it is mr. eckart's fearfulness what triggers 'the butterfly effect' and what leads to drastic consequences for the rest of the world.