The Following Figure Shows the Market for a Good

The following figure shows the market for a good.Which of the following is most likely to shift demand from D' to D? Figure 4.6
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A) An increase in the price of a substitute good
B) An increase in the number of consumers
C) A decrease in the price of a complementary good
D) A decline in consumers' incomes if it is a normal good
E) An increase in consumers' incomes if it is a normal good