According to the Table Below,the Opportunity Cost of One Unit

According to the table below,the opportunity cost of one unit of rice for the US is equal to:

Production Possibility Schedule for Rice and Pudding in the United States and the United Kingdom
$\begin{array}{|cc|cc|}\hline \text { United States } &&\text {United Kingdom } \\\hline \text {Rice} & \text {Pudding} &\text { Rice }& \text {Pudding} \\\hline 140 & 0 & 35 & 0 \\\hline 120 & 10 & 30 & 10 \\\hline 100 & 20 & 25 & 20 \\\hline 80 & 30 & 20 & 30 \\\hline 60 & 40 & 15 & 40 \\\hline 40 & 50 & 10 & 50 \\\hline 20 & 60 & 5 & 60 \\\hline 0 & 70 & 0 & 70 \\\hline\end{array}$

A) 1/2 units of pudding
B) 5 units of pudding
C) 10 units of pudding
D) 2 units of pudding