Why is it essential to differentiate between real and nominal growth rates of GDP? A. The nominal growth rate is more informative than the real growth rate since it is broader in the sense that it captures both price and output changes. B. The nominal growth rate combines the effect of price changes along with changes in the production of goods and services and thus gives a less clear indication of the impact on living standards. C. It is the real growth rate that is meaningful since it indicates the change in the production of goods and services, a very significant source of improved living standards. D. All of the above. E. B and C only