I have like 4 answers left so best help me

Which statement best summarizes the origins of world war ll

How did the battle of okinawa affect president truman’s decision to use the atomic bomb against japan? it showed that japan was close to surrendering. it showed that the us could not win the war without it. it showed that japan was willing to fight to the end. it showed the us could easily defeat japan.

In what year did vladimir lenin and the bolsheviks seize power in russia? 1885 1900 1917 1961