Figure 4-9

Figure 4-9
Panel (a)
Panel (b)
-Refer to Figure 4-9. The graphs show the demand for cigarettes. In Panel (a) , the arrows are consistent with which of the following events?

A) The price of marijuana, a complement to cigarettes, increased.
B) Mandatory health warnings were placed on cigarette packages.
C) Several foreign countries banned U.S. cigarettes in their countries.
D) A tax was placed on cigarettes.