When Thurston catches 10 fish a day, he can gather a maximum of 40 coconuts, and when he catches 20 fish a day, he can gather a maximum of 30 coconuts. If Thurston's opportunity cost of producing each good increases as he produces more of it, and he decides to catch 30 fish a day, then the maximum number of coconuts he can gather must be:
A. equal to 20.
B. less than 20.
C. greater than 20.
D. greater than 10.
Answer: B
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