Answer:
C. f/1.2
Explanation:
The camera can only focus the lens on a single point, but there will be an area that extends in front of and behind this focus point that still appears sharp in your photograph.
This zone is known as the depth of field. It is not a fixed distance, it changes size and can be described as shallow (where only a narrow zone appears sharp) or deep (where more of the image is visible).
To really understand depth of field, you need to know the lens aperture and focusing distance closely.
Large openings correspond with the small f-stop numbers available on your camera. So an f / 2.8 aperture is wide, while an f / 22 aperture is small.
Once again, focal length plays an important role in the overall effect of your images. With large apertures you get more depth of field when focusing on a distant subject than on subjects near the lens.
