Table 1 Shows the Units of Output a Worker Can

Table 1 shows the units of output a worker can produce per month in Australia and Korea. ?
$\begin{array}{|l|l|l|}\hline & \text { Food } & \text { Electronics } \\\hline \text { Australia } & 20 & 5 \\\hline \text { Korea } & 8 & 2 \\\hline\end{array}$
Refer to table 1. The opportunity cost of 1 unit of food in Australia is

A) 1/5 of a unit of electronics.
B) 5 units of electronics.
C) 4 units of electronics.
D) 1/4 of a unit of electronics.