Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

Jimmy Brown, a financial advisor, wants to use the GDP deflator to measure the change of the macroeconomic environment. If the GDP deflator is 80, it is most likely to conclude that the nominal GDP is:
Option A:less than real GDP.
Option B:equal to real GDP.
Option C:greater than real GDP.

Answer: A