Final answer:
The correct sentence that uses 'alternative' as an adjective is sentence C
Step-by-step explanation:
The sentence, 'There is almost no alternative to eating processed food,' correctly uses the word alternative as an adjective. Here, the word alternative describes the noun 'to eating processed food' and is used to indicate that there are very limited options available. Other examples of the word alternative being used as an adjective include 'alternative medicine' or 'alternative routes.'
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