What was the significance of the Battle of Tannenberg in World War I?

Question

a.) The incoming British military forces amply supplied the Allied lines to prevent Germany from invading Paris.
b.)The attack on civilians by German war boats during the battle led to the United States entering the war.
c.)The defeat of British forces shifted the Allied war focus to defeating the Ottoman Empire.
d.)The failed Russian offensive into German territory represented the ineffectiveness of the Russian military.
D?

Answer 1

Yes, d.

Answer 2

Thank u (:

Answer 3

You're welcome.