Figure: the Market for Spanish Textbooks

Figure: The Market for Spanish Textbooks
(Figure: The Market for Spanish Textbooks) Look at the figure The Market for Spanish Textbooks.Suppose the government believes the producers of Spanish textbooks are not profitable and it wants to make sure textbook producers are profitable.It could impose a price control called a ________ and, to be binding, one possible price would be _.
A.price floor; $90
B.price floor; $40
C.price ceiling; $40
D.price ceiling; $90