Answer:
D
Step-by-step explanation:
Looking at the image, it looks like there is some kind of spider-like insect suspended in what is probably some kind of hardened sap or amber. We cannot tell how long the insect has been captured in this substance, but we can note that it looks remarkably well-preserved. Therefore, it must be D.
Just a note that usually, any type of fossil that looks similar to this (where an organism is locked inside amber or hardened resin) is considered a "preserved remains" fossil.
Hope this helps!