Answer:

The correct answer is option 'B', which is "image-rendering".

Explanation:

When stretching or resizing images, it is necessary to determine how the pixels in the image are adjusted to fit the new size. This is done through a process called resampling, which involves calculating the color and intensity values of the new pixels based on the existing pixels in the image.

The property that defines the resampling method to use when stretching images is called "image-rendering". This property is a CSS property that can be applied to an image element in HTML or to an image in CSS.

Interpolation-mode:
The option 'A' mentioned in the question, "interpolation-mode", is not the correct property that defines the resampling method for stretching images. "interpolation-mode" is a property used in older versions of Internet Explorer to control the interpolation method used for scaling images.

Image-rendering:
The correct property, "image-rendering", specifies how the browser should render the image when scaling or stretching it. It controls the resampling algorithm used to calculate the color and intensity values of the new pixels.

The possible values for the "image-rendering" property are:
1. auto: The browser chooses the resampling algorithm automatically.
2. crisp-edges: The resampling algorithm preserves sharp edges, but may result in pixelation.
3. pixelated: The resampling algorithm results in a pixelated appearance, which can be useful for retro or low-resolution effects.
4. optimizeSpeed: The resampling algorithm prioritizes speed over quality.
5. optimizeQuality: The resampling algorithm prioritizes quality over speed.

By setting the "image-rendering" property to the desired value, the developer can control the resampling method used when stretching or resizing images.

In conclusion, the correct property that defines the resampling method when stretching images is "image-rendering". It allows developers to specify how the browser should render the image based on their desired balance between quality and speed.