The correct answer is B. Fit.
The Fit mode sizes an image to fit the control while maintaining the proportions of the original image. This means that the image will be stretched or shrunk to fit the control, but the aspect ratio of the image will be kept the same.
The Clip mode crops the image to fit the control. This means that the image will be cut off at the edges if it is too large to fit in the control.
The Stretch mode stretches the image to fill the control, regardless of the aspect ratio of the image. This can result in the image being distorted.
The Zoom mode enlarges the image to fill the control. This can result in the image being pixelated.