Refer to the Above Graph, Which Shows the Market for Chicken

Refer to the above graph, which shows the market for chicken where D₁ and D₂ represent different demand curves.A change from E₁ to E₂ is most likely to result from:

A) an increase in expectations of higher future prices for chicken.
B) an increase in the cost of chicken feed to produce chickens.
C) a decrease in the price of beef products.
D) an increase in consumer incomes.