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Verbal·Standard English Conventions·Boundaries

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By analyzing the level of radioactive decay within a fossil specimen, scientists can establish the age of that fossil with a high degree of precision. When radioactive elements aren’t present, scientists turn to __________ analysis of Earth’s sediment layers (strata)—to estimate how old a fossil is based on the age of the strata in which the fossil is found.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

stratigraphy—the

B

stratigraphy, the

C

stratigraphy: the

D

stratigraphy (the