The Accompanying Tables Give Production Possibilities Data for Gamma and Sigma

The accompanying tables give production possibilities data for Gamma and Sigma. All data are in tons. Gamma's production possibilities
$\begin{array}{c|c|c|c|c|c} & \mathrm{A} & \mathrm{B} & \mathrm{C} & \mathrm{D} & \mathrm{E} \\\hline \text { Tea } & 120 & 90 & 60 & 30 & 0 \\\hline \text { Pots } & 0 & 30 & 60 & 90 & 120 \\\hline\end{array}$ Sigma's production possibilities
$\begin{array}{c|c|c|c|c|c} & \mathrm{A} & \mathrm{B} & \mathrm{C} & \mathrm{D} & \mathrm{E} \\\hline \text { Tea } & 40 & 30 & 20 & 10 & 0 \\\hline \text { Pots } & 0 & 30 & 60 & 90 & 120 \\\hline\end{array}$ What are the limits of the terms of trade between Gamma and Sigma?

A) 1 tea = 2 pots to 1 tea = 6 pots
B) 1 tea = 3 pots to 1 tea = 6 pots
C) 1 tea = 2 pots to 1 tea = 3.5 pots
D) 1 tea = 1 pot to 1 tea = 3 pots