Eileen Has a Comparative Advantage Over Jan in Piano Tuning

Multiple Choice

Eileen has a comparative advantage over Jan in piano tuning but NOT in shoe polishing.What can therefore be concluded?  

A)  Jan must have an absolute advantage in piano tuning. 
B)  Eileen must have an absolute advantage in shoe polishing. 
C)  Jan must have a lower opportunity cost of shoe polishing. 
D)  Eileen must have an absolute advantage in shoe polishing and in piano tuning.