Question

What was a major catalyst for World War I?

Unrest of the poor and oppression of the weak would be major issues prompting World War I.
Treaties that forced many countries to get involved if an alliance member was attacked.
European countries invading each other for land.
Empires granting their colonies independence, leaving them to fend for themselves.

Answer 1

B. Treaties that forced many countries to get involved if an alliance member was attacked

Step-by-step explanation:

Answer 2

B. Treaties that forced many countries to get involved if an alliance member was attacked