The estimates of the current rates of extinction indicated that rates may be greater than the mass extinctions at the close of the Cretaceous period.
The Cretaceous Period was an historical period noted for being the last portion of the "Age of Dinosaurs"
Hence, the estimates of the current rates of extinction indicated that rates may be greater than the mass extinctions at the close of the Cretaceous period.
Therefore, the Option C is correct.
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