Just shows a timeline from 1820 to 1920

for how many years were tensions between european nations growing before world war i finally broke out?

a 19 years
b 50 years
c 45 years
d 15 years

Exposition : comprehensive description and explanation of a theoryso the one that best describe it would be : d. writing which explains information by using things such as definitions, compare - and - contrast, and cause-and-effect

Provide the map so can answer the question