If countries $\backslash ($ A $\backslash )$ and $\backslash ($ B $\backslash )$ produce only either rubber bands or paper clips, their maximum outputs are shown in the accompanying production possibilities schedules.

In country A the opportunity cost of $1$ paper clip is

Multiple Choice

$2$ rubber bands.

$1$ rubber band.

$0\mathrm{.}5$ rubber band.

$0\mathrm{.}25$ rubber band.