Figure: Positive Externalities and the Production of Semiconductor Chips

Multiple Choice

Figure: Positive Externalities and the Production of Semiconductor Chips
(Figure: Positive Externalities and the Production of Semiconductor Chips) Look at the figure Positive Externalities and the Production of Semiconductor Chips.If the socially optimal production of chips is 600, the government could achieve the
Socially optimal level of production by granting a Pigouvian subsidy of:

A) $5.
B) $10.
C) $15.
D) $20.