Suppose the total monetary value of all final goods and services produced in a particular country in 2015 is $500 billion and the total monetary value of final goods and services sold is $450 billion.
We can conclude that:

A. GDP in 2015 is $450 billion
B. NDP in 2015 is $450 billion.
C. GDP in 2015 is $500 billion.
D. Inventories in 2015 fell by $50 billion.