A graph plots civilian goods versus defense goods. Two parallel curves labeled C D and A B are shown.The horizontal axis is labeled defense goods. The vertical axis is labeled civilian goods. The graph shows two curves C D and A B$.$ Curve C D begins at a point marked C on the top of the vertical axis. It goes slightly down and to the right till it reaches a point and then goes down and to the right with increasing steepness until it reaches point D marked on the right end of the horizontal axis. Curve A B is similar to the first curve. Point A is slightly below point C and point B is to the left to point D$.$ There are two points, x and y on curve A B$,$ with x up and to the left of y$.$

Refer to the diagram. The U$.$S$.$ response to the events of September $11,2001,$ is illustrated by the

Multiple Choice

move from y to x on production possibilities curve AB$.$

shift of the production possibilities curve from AB to CD$.$

move from x to y on production possibilities curve AB$.$

shift of the production possibilities curve from CD to AB$.$