In the diagrams below, S1 S_1\,S1 and D1 D_1\,D1 show the original supply and demand curves for Good Y, while S2 S_2\,S2 and D2 D_2\,D2 show shifts of these curves.
Which diagram, A, B, C or D, illustrates the effects of a fall in consumer real incomes (assuming Good Y is a normal good) and a substantial increase in the wages paid to workers in the industry producing Good Y?

Diagram A
Diagram B
Diagram C
Diagram D