The demand for Good X is given in the graph shown here.

Which of the following could cause the shift of demand shown here? The demand for Good X is shown in graph;

a) An increase in the price of good Y which is a complement to good X

b) People do not like good X as much as they did before

c) An increase in the number of buyers of a good

d) An increase in income if good X is an inferior good

e) Buyers of good X expect the price of good X to decrease in the future