If Kami can produce 40 portable power banks or 30 cellphones during a month's time, while Sally can produce 10 portable power banks or 20 cellphones, then it is correct to state that
A) Kami has a comparative advantage in producing portable power banks.
B) Kami has a comparative advantage in producing both portable power banks and cellphones.
C) Sally has a comparative advantage in producing both portable power banks and cellphones.
D) Sally has an absolute advantage in portable power banks.
Answer: A
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