Answer the Question on the Basis of the Following Production

Answer the question on the basis of the following production possibilities tables for countries Alpha and Beta: Alpha Production Possibilities:

$\begin{array} { l c c c c } & \underline { \mathrm { A } } & \underline { \mathrm { B } } & \underline { \mathrm { C } } & \underline{ \mathrm { D } } \\ \text { Product } X & 3 & 2 & 1 & 0 \\ \text { Product } Y & 0 & 4 & 8 & 12 \end{array}$

Beta Production Possibilities:

$\begin{array} { l c c c c } & \underline { \mathrm { A } } & \underline { \mathrm { B } } & \underline { \mathrm { C } } & \underline { \mathrm { D } } \\\text { Product } X &6&4&2&0\\\text { Product } Y & 0 & 4 & 8 & 12 \end{array}$ Refer to the tables.The domestic opportunity cost of one unit of X in Beta is:

A) 2 units of Y.
B) 4 units of Y.
C) 1 unit of Y.
D) 3 units of Y.