Figure 21-4 in Each Case, the Budget Constraint Moves from BC-1 to BC-1

Multiple Choice

Figure 21-4
In each case, the budget constraint moves from BC-1 to BC-2.
-Refer to Figure 21-4. Which of the graphs in the figure could reflect an increase in income?

A) graph a
B) graph b
C) graph d
D) None of the above is correct.