Refer to the above graph. If the current market price rises from $60 to $70 and user costs are not considered, the extraction quantity:

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Refer to the above graph. If the current market price rises from $60 to $70 and user costs are ot considered, the extraction quantity:
A. Rises by 10 units to 20 units
B. Falls by 10 units to 20 units
C. Falls by 20 units to 10 units
D.  Rises by 10 units to 40 units

ANSWER:

D.  Rises by 10 units to 40 units