What was the result of the Allied invasion of Normandy on D-Day?

a.)Germans lost hope and immediately surrendered.
b.)The invasion caused Adolf Hitler to commit su!c!de.
c.)Germany was forced to split its armies to fight on two fronts.
d.)Russia was liberated, giving the Allies a base from which to fight.

I think the answer is b

Explanation:

process of elimination

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.