Correct answer is D. Paraphrase the key infomation in the source
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A gerund is a verb that ends with -ing so the answer to your question would be folding.
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Answer:
The underground railroad
Explanation:
The 'underground railroad' was known as such due to the slaves using it to escape and the people helping them to escape using secret codes that were commonly associated with railroads.
(Ex: 'station masters' = people who would hide slaves)
