The construction crew discovered a cache of ________ historical artifacts buried underneath the foundational pillars.

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A century-old
B century-olds
C centuries-old
D centuries-olds

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Answer: A. century-old

Answer: A) century-old
Explanation: When a compound number-noun phrase acts as a hyphenated adjective before a noun, the noun inside that compound modifier (century) must always remain singular.

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The construction crew discovered a cache of ________ historical artifacts buried underneath the foundational pillars.

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