Without Adjusting for PPP,emerging Economies Contribute About 30% of the Global

Multiple Choice

Without adjusting for PPP,emerging economies contribute about 30% of the global GDP.Adjusting for PPP,they now contribute approximately 50% of the global GDP.The reason there is a huge difference between the two measures is because 

A)  the cost of living in emerging economies tends to be lower than that in developed economies. 
B)  the purchasing power parity is much higher in emerging countries. 
C)  the population in emerging economies is much higher than that in developed economies. 
D)  the deficit spending in emerging economies is much larger than that in developed economies.