Hello I have an economics math question and have provided the question via image. I need help with

The figure given below shows the macroeconomic equilibrium of a country. Figure 10.7 45' Line C+1+G+X 3,000- 2,500- Aggregate Expenditures (dollars) 2,000 1,500- 1,000- 0 1,000 2,000 3,000 Real GDP (dollars) In the figure, C: Consumption I: Investment G: Government expenditure X: Net Exports Refer to Figure 10.7. What is the size of the GDP gap if potential GDP equals $3,000? O a. $500 O b. $2,500 O c. $3,000 O d. $1,000 O e. $2,000