The Table Above Shows United States and United Kingdom Production

Multiple Choice

The table above shows United States and United Kingdom production of wheat (bushels per hour) and cloth (yards per hour) .
In order for both countries to gain from trade,one bushel of wheat must trade for

A) between 6 and 18 yards of cloth.
B) between 1/2 and 2 yards of cloth.
C) between 1/3 and 3 yards of cloth.
D) between 1/2 and 1/3 yards of cloth.