Homework $1$A: Production Possibility Frontier $($PPF$)$ Question

Please use the PPF data below to answer the following questions. Assume the points satisfy the assumption of full employment and fixed technology in this economy. The two goods the economy produces are bags of tea and bags of snacks in these combination:

Tea

Snacks

A $0$

$14$

B $1$

$13$

C $2$

$10$

D $3$

$6$

E $4$

$0$

What is the opportunity cost per$-$unit gained when moving production from point $(0\mathrm{.}5$ points each$)$