Of the given options, it is the clam which is most likely to fossilize.
What is fossilization?
It is the process by which an animal or plant become preserved in a hard and petrified form. The phenomenon usually leads to impression of an organism being left in a rock. The animals, which are devoid of skeletons do not fossilize, as they decompose very briskly. Thus, jellyfish cannot be fossilized.
On the other hand, the animals possessing hard skeletons get fossilize easily. The hard shells of clam makes it perfect for fossilization, as they can withstand force and pressure, which is the primary requirement for fossilization. The most common fossils are shells of marine species like snails, clams, and corals.
Thus, a clam is most likely to get fossilize.
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