The diagram below shows an undisturbed rock. A rock sample is shown with four layers marked A, B, C, D from top to bottom. Which of the following is true about the fossils found in layer B? It is the oldest among fossils in all other layers. It is the youngest among fossils in all other layers. It has more similarity to fossils in layer A than layer D. It has more similarity to fossils in layer D than layer C.

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