Tom Is a Castaway Who Washes Up on a Remote

Tom is a castaway who washes up on a remote island.He can kill eight birds per hour or catch ten fish per day.The natives on the island can kill ten birds per day or catch twenty fish per day.According to comparative advantage,

A) Tom should kill more birds and fish less, then trade birds for fish.
B) Tom should kill fewer birds and fish more, then trade fish for birds.
C) Both should kill more birds and fish less.
D) Both should kill fewer birds and fish more.