Answer:
B) the reallocation of resources between military and civilian goods.
Explanation:
PPC is the graphical representation of product combinations that an economy can produce, given resources & technology.
Given same resources & technology, the two goods are inversely related - one good's quantity can be increased by decreasing the quantity of other good.
PPC is based on the assumption that resources are efficiently utilised & all points on PPC denote product combinations efficiently utilising resources.
So, movement along the PPC boundary means production level intact at full efficiency level & just reallocation of resources between good 1 to good 2, i.e here b/w military & civilian goods.