Question

For how many years were tensions between European nations growing before WWI finally broke out? ninety years fifty years forty-five years fifteen years

Answer 1

It's 90 years!

Step-by-step explanation:

1914 - 1821 = 93 (which is approximately 90 years and the only close answer choice)

Answer 2

90 years

Step-by-step explanation:

I did quick maths