Answer:
D They first show up with a very stretched, blocky appearance.
Step-by-step explanation:
An interlaced image format is one that is read left to right and it is displayed increasingly in a browser as it is been downloaded.
Option A is not correct as interlaced image load gradually before displaying completely so it cannot provide standard animation than standard image.
Option B is not correct as interlaced image support format like PNG, JPEG, GIF etc
Option C is not correct as the interlaced image is loaded gradually
Option D is correct because interlaced image load gradually (incremental) before the correct view is displayed. So the image first appear show up with a very stretched blocky appearance.