The diagram below shows fossils in three layers of rocks.

Picture shows three layers of rocks labeled Layer A, Layer B, and Layer C from bottom to top. Each layer of rock has a fossil.

Which of these conclusions is most likely correct about the organisms found in the layers of rocks?

The organism in Layer A is more complex than the organism in Layer B.
The organism in Layer B is more complex than the organism in Layer C.
The organism in Layer C is a modern form of the organism in Layer B.
The organism in Layer A is a modern form of the organism in Layer B.