B. You can be used as both. Here is an example. "You said you wanted this bear, so I got it for you." You is used as both a subject and object pronoun.
Answer:
A.
Therefore, the art of quilling will interest those who want to use their artistic touch and make their surroundings more beautiful.
Explanation:
I think the answer is A because its a wrap-up of everything written in the paragraph, which makes it a good conclusion. It summarizes what was in the paragraph while making a final point on quilling.