-Refer to the Table in the Exhibit

Multiple Choice

$\begin{array}{l}\text { Schedule for Real GDP, Net Taxes and Government Purchases (Trillions of Dollars) }\\\begin{array}{ccccccccc}\hline \begin{array}{c}\text { Real } \\\text { GDP }\end{array} & \begin{array}{c}\text { Net } \\\text { taxes }\end{array} & \begin{array}{c}\text { Disposable } \\\text { income } \\(Y) \end{array} & \begin{array}{c}\text { Consumption } \\(N T) \end{array} & \begin{array}{c}\text { Saving } \\(Y-N T) \end{array} & \begin{array}{c}\text { Planned } \\\text { investment } \\(S) \end{array} & \begin{array}{c}\text { Net } \\\text { exports } \\(N X) \end{array} & \begin{array}{c}\text { Government } \\\text { purchases } \\(G) \end{array} & \begin{array}{c}\text { Planned } \\\text { aggregate } \\\text { expenditure } \\(C+I+N X+G) \end{array} \\\hline 3.0 & 0.9 & 2.1 & 2.0 & 0.1 & 0.5 & -0.2 & 0.9 & 3.2 \\3.6 & 0.9 & 2.7 & 2.4 & 0.3 & 0.5 & -0.2 & 0.9 & 3.5 \\4.2 & 0.9 & 3.3 & 2.8 & 0.5 & 0.5 & -0.2 & 0.9 & 4.0 \\4.8 & 0.9 & 3.9 & 3.2 & 0.7 & 0.5 & -0.2 & 0.9 & 4.4 \\5.4 & 0.9 & 4.5 & 3.6 & 0.9 & 0.5 & -0.2 & 0.9 & 4.8 \\\hline\end{array}\end{array}$
-Refer to the table in the exhibit.Which variables are autonomous?  

A)  Only saving and consumption are autonomous. 
B)  Only net taxes and government purchases are autonomous. 
C)  Only net exports and government purchases are autonomous. 
D)  Investment, net exports, net taxes, and government purchases are autonomous.