$(01\mathrm{.}05$ HC$)$

Graph shows an upward$-$sloping line labeled S$1.$ Another upward$-$sloping line, labeled S$2,$ appears to the left of S$1.$ A third upward$-$sloping line, labeled S$3,$ appears to the right of S$1.$

Which of the following could explain the sequence shown above?

Question $5$Select one:

a$.$

Suppliers expect demand for Z is about to go up and then learn that they are wrong.

b$.$

Suppliers shift to the production of another good instead of Z$,$ and then consumer tastes shift toward a greater preference for Z$.$

d$.$

Suppliers raise the price for Z and then realize they overestimated demand and lower the price much more.

e$.$

Suppliers lose a subsidy that the government had been giving, and then the cost of an input for Z decreases by more than the value of the subsidy.