9
In his grandmother’s cellar, Darius finds some small, clear jars, almost in the shape of a soda bottle. He asks his grandmother what they were for, and she replies that they were milk bottles. She tells Darius that milk used to be dropped off in those clear bottles by the milkman twice a week. Darius thinks of the milk cartons his mom buys, which are an opaque white. Which statement BEST explains why Darius’s milk is no longer delivered in clear glass bottles?

A.
The old glass bottles leached dangerous chemicals into the milk.

B.
Glass bottles could not be safely kept in a cold refrigerator.

C.
Not all milk produced by modern cows is the same color.

D.
Dairy producers found that light makes milk spoil more quickly.