The correct answer to this open question is the following.
Despite the belief that the war would be over quickly, a stalemate occurred along the Western Front due to the fact that the German troops could not defeat France quickly and soldiers dug trenches. Germany assumed a defensive position during the stalemate of 1917.
The Allies, under the command of French leader Robert Nivelle, decide to move and attack the Germans, but they decide to withdraw to the Hinderburg Line. So plans changed, and the decision was to attack the Germans in the Battle of Arras of April 4, 1917, with the direct support of the British troops.
Not much is known on the topic, however, if you go to this link you can read his diary (it is extremely interesting)
http://enroll.nationalww2museum.org/education/for-teachers/lesson-plans/d-day-diary.pdf
I think answer is B
<span>The Soviets did not uphold their post war commitments</span>
Mughals succeeded in India because Indians had a vast mixture of the religious cultures and Mughals adopted some Hindu traditions in their culture and empire, as it was difficult to convert all Indian population into Islam, because of the great distance of the Mecca and Medina, from India. Mughals created a sub-culture by infusing various Hindu practices. They also improved the religious tolerance among people, and thus, succeeded in ruling India.
The answer is A. the iron act