21.In the above figure the economy is initially at point A on the aggregate expenditure curve $AE_0$. Suppose firms expect profits to increase and decide to increase investment. As a result ______
(A) there is a movement along $AE_0$ to a point such as B.
(B) there is a movement along $AE_0$ to a point such as C.
(C) the $AE$ curve shifts downward to a curve such as $AE_1$.
(D) the $AE$ curve shifts upward to a curve such as $AE_2$.

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