Its C Their because their is the only option refering correctly to the sentence. Read the sentence out loud with option C and you will "C" that it is correct lol
I’m pretty sure it is to read the text
Material made of drawn out, twisted fiber, used for fastening, tying, or lacing. A strand or cord of such material.
Happy studying ^_^<span>
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Answer:
You receive a letter in the mail from a secret admirer.