She has lived there ______ ten years.

• A. Since
• B. During
• C. For
• D. By

Answer: (C)

When we want to say how long something has continued up to now, we use the present perfect with for a length of time. Here, ten years is the duration, and living there has continued up to the present, so the natural fit is for.

Since would require a starting point, like a specific year or event (for example, since 2014 or since she moved there). Ten years by itself isn’t a starting moment, so it’s not correct here. During points to a period within something, typically with a clear frame like during the last ten years; without that framing it sounds off. By is used for deadlines or reference points (by next year, by ten o’clock), not for expressing a lasting duration.

So the sentence correctly uses for: She has lived there for ten years.