What does CC BY allow?

• A. The work can be used without any attribution.
• B. It can be used for commercial purposes without restrictions.
• C. Can be used freely as long as the source is quoted.
• D. It requires permission from the author for any reuse.

Answer: (C)

CC BY lets people reuse a work freely as long as they give proper credit to the creator. You can copy, share, adapt, and even use it commercially, but attribution is required and you should note if you’ve made changes. That’s why the idea that you can use it freely as long as the source is credited fits best: attribution is the essential condition for reuse. The other statements don’t fit because one says no attribution is needed, which isn’t true; another implies unrestricted commercial use without mentioning attribution, which isn’t accurate; and another says you must obtain permission for any reuse, whereas CC BY grants permission through the license as long as attribution is provided.