Which of the following statements is correct?

A) If a country has an annual growth rate of 4%, it will take about 36 years for the country's GDP to double

B) "Lucas Wedge" is another name for "Okun's Gap"

C) Nominal GDP is always bigger than real GDP

D) The GDP growth rate of developing countries is usually smaller than the GDP growth rate of rich, developed countries

E) None of the above.