Which of the Following Statements Is True

Which of the following statements is true?

A) The GDP per capita in most of the Western world has almost been constant since the beginning of the twentieth century.
B) The GDP per capita of a nation at a particular point of time is not the same as the income of all individuals in that nation.
C) GDP per capita is a useful tool to study the disparities in the standards of living in a country.
D) GDP per capita decreases with a decrease in population and increases with an increase in population, GDP remaining unchanged.