A scientist is using relative dating to determine the age of a fossil that she discovered.

What would allow her to draw the best conclusions about fossils that are younger than the one she discovered?

measuring the amount of carbon and nitrogen in the surrounding rock
measuring the amount of potassium and argon in the surrounding rock
finding fossils in the same area that are in layers deeper under the surface
finding fossils in the same area that are in layers closer to the surface
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