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
$\begin{array} { | l | c | c | c | c | c | } \hline & A & B & C & D & E \\\hline Tea & 120 & 90 & 60 & 30 & 0 \\\hline Pots & 0 & 30 & 60 & 90 & 120 \\\hline\end{array}$
Sigma's production possibilities
$\begin{array} { | l | c | c | c | c | c | } \hline & A & B & C & D & E \\\hline Tea & 40 & 30 & 20 & 10 & 0 \\\hline Pots & 0 & 30 & 60 & 90 & 120 \\\hline\end{array}$ 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