The League of Nations established the mandate system in the Middle East after WWI. It was a result of the weakening and disintegration of the Ottoman Empire, one of the losing powers of WWI. Before its end, British and French interests had been putting pressure on the Ottoman territories in the region.
The League created three types of mandates. The A Class corresponded to the former Ottoman territories in the Middle East. In this region, France and Britain received the important mandates.
I'll first explain what the non-aggression pact was. It was an agreement that the Soviet Union and Germany would take no military action against each other. To answer your question it is B. The pact was to make sure he could safely attack Poland.
