The correct option is B The US was experiencing Great Depression which collapsed their economy in 1929.
The USA was experiencing Great Depression which collapsed their economy in 1929. People suffered a lot from poverty, hunger and unemployment. Automobile industry, agriculture production, consumer durable manufacturing, mining, shipbuilding and other industries witnessed a fall. They stayed away from the Second World War initially but when Japan attacked Pearl Harbour, a military base of the USA, in 1941, the USA was forced to enter the war. The USA fought the war along with the Allied forces and began to succeed