One way to calculate gdp is the income approach, which

1There are three ways of calculating GDP - all of which in theory should sum to the same amount:

2National Output = National Expenditure (Aggregate Demand) = National Income.

3(i) The Expenditure Method - Aggregate Demand (AD)

4GDP = C + I + G + (X-M) where.

5The Income Method – adding together factor incomes.

the answer is definitley b!