Figure: Shifts in Demand and Supply II

Figure: Shifts in Demand and Supply II
(Figure: Shifts in Demand and Supply II) Look at the figure Shifts in Demand and Supply II.The figure shows how supply and demand might shift in response to specific events.Suppose the technology for producing ethanol fuel improves.Which panel best describes how this will affect the market for ethanol?
A.panel A
B.panel B
C.panel C
D.panel D