Scenario: the Figure Below Shows the Supply and the Demand

Scenario: The figure below shows the supply and the demand for a good (left) and the cost curves of an individual firm in this market (right) . Initially, all firms in this market have identical cost curves MC₁ and ATC₁, and the market is in equilibrium at point A. Subsequently, a new production technology has been developed for this product. Some of the existing firms as well as some new firms have adopted the new technology, and their cost curves are MC₂ and ATC₂.

-Refer to the figure above.Suppose that,due to firm entries,the supply curve has shifted so that the equilibrium price has reached $1.50.Subsequently,further entries lower the equilibrium price to $0.90.At this point,________.

A) only the firms with new technology enter the market
B) only the firms with old technology enter the market
C) existing firms (with old technology) exit the market
D) existing firms (with new technology) exit the market