Answer : A. Real GDP increases,but GDP per Capita increases.
The GDP of a country is measured by
GDP = C+ I + G +(X-M)
Where
C = Consumption Expenditure
I = investment Expenditure
G = Government Spending
X = Exports
M = Imports
When government spending increases on account of purchases of good and services by the government, it increases the demand for goods and services. This increases the aggregate demand.
Given that quantitatively aggregate demand is equal to real GDP, an increase in aggregate demand will result in an increase in Real GDP, if all other things remain the same.
An increase in real GDP will, in turn, result in an increase in per capita income.