Bonnie can produce either 10 hats or 20 scarves in a month. Phil can produce either 5 hats or 10 scarves in a month. Therefore:

A) Phil has a comparative advantage in hats, Bonnie in scarves.
B) Bonnie has a comparative advantage in hats, Phil in scarves.
C) Phil has a comparative advantage in both hats and scarves.
D) Bonnie has a comparative advantage in both hats and scarves.
E) Neither of them has a comparative advantage in hats or scarves.

E