Answer:
In March 1917, the army garrison at Petrograd joined striking workers in demanding socialist reforms, and Tzar Nicholas II was forced to abdicate.
Explanation:
It is b, because my teacher had once taught me about that.
I believe it is All of them I am 100% Sure My Grandfather is a historian i live with him
<span>Oswiu, <span>King of Northumbria</span></span>
