Figure 21-3 in Each Case, the Budget Constraint Moves from BC-1 to BC-1

Multiple Choice

Figure 21-3
In each case, the budget constraint moves from BC-1 to BC-2.
-Refer to Figure 21-3. Which of the graphs in the figure could reflect a simultaneous decrease in the prices of both goods? (i)
Graph a
(ii)
Graph b
(iii)
Graph c
(iv)
Graph d

A) (i) only
B) (iv) only
C) (ii) or (iii) only
D) None of the above is correct.