5. Countable, Specific Nouns : Undefined or Defined?

Choose A, B, or C.
If you can answer the question,
"Which...?" about the word in italics,
choose the.

If you cannot answer the question,
"Which...?" about the word in italics,
choose a / an or Ø (no article).

Note
Adjectives do not usually define a noun; they create a sub class.
"German beer" is a sub class of "beer".
Only superlative adjectives define a noun - because there is only one of a class that is the best, biggest, longest, etc.