c$.$ At which point$($s$)$ is the output combination unattainable with available resources and technology?

a $x$

$A$

$$

c

$Y$

d$.$ Which curve best represents the change that would occur if the resources of this society increased?

$PP{C}_1$ to $PP{C}_2$

$PP{C}_1$ to $PP{C}_3$

e$.$ Which curve best represents the change that would occur with a huge natural disaster that destroyed one$-$third of production capacity?

$PP{C}_1$ to $PP{C}_3$

$PP{C}_1$ to $PP{C}_2$