Fact 1: Bacteria cause food to spoil. Fact 2: Milk was loaded with bacteria that quickly spoiled, making it undrinkable. Given the two facts above, what can make milk undrinkable?

Choices:
(I) evaporation
(II) Enzymes
(III) boiling
(IV) glycogen
(V) liquid
(VI) nutrients
(VII) bacteria
(VIII) vaporization
The answer is:
(VII)