The Accompanying Tables Give Production Possibilities Data for Gamma and Sigma

Multiple Choice

The accompanying tables give production possibilities data for Gamma and Sigma. All data are in tons.
Gamma's production possibilities
$\begin{array} { | l | c | c | c | c | c | } \hline & A & B & C & D & E \\\hline Tea & 120 & 90 & 60 & 30 & 0 \\\hline Pots & 0 & 30 & 60 & 90 & 120 \\\hline\end{array}$
Sigma's production possibilities
$\begin{array} { | l | c | c | c | c | c | } \hline & A & B & C & D & E \\\hline Tea & 40 & 30 & 20 & 10 & 0 \\\hline Pots & 0 & 30 & 60 & 90 & 120 \\\hline\end{array}$
On the basis of this information,

A) Gamma should export both tea and pots to Sigma.
B) Sigma should export tea to Gamma, and Gamma should export pots to Sigma.
C) Gamma should export tea to Sigma, and Sigma should export pots to Gamma.
D) Gamma should export tea to Sigma, but it will not be pro?table for the two nations to exchange pots.