ABC analysis is based upon the principle$$ that:

Part $2$

A$.$

all items in inventory must be monitored very closely.

B$.$

as with grade distributions in many MBA$$ courses, there should be more$$ medium$-$level $"$B$"$ items than either$"$A$"$ or$"$C$"$ items.

C$.$

more time should be spent on class$"$C$"$ items because there are many more of them.

D$.$

there are usually a few critical$$ items, and many items that are less critical.

E$.$

an item is critical if its usage is high.