the correct answer is option <u>D) "Grijalva, the Usumacinta, and the Conchos."</u>
Explanation:
There are several puntuation rules about comma usage. We use commas to separate words or group of words in a series. We also use comma within a series before the connector "and".
In the example provided, the only correct answer is D) since comma is used after each item in the list.
