Answer:
C. Laura and David Hollis, two of the nicest people you will ever meet, have been brought on as the new creative team for Globocon Inc.
Step-by-step explanation:
This is the sentence that is written correctly. This sentence contains an appositive. An appositive is a noun or a noun phrase that renames another noun right beside it. Appositives should always be separated from the rest of the sentence by commas. In this example, the appositive is "two of the nicest people you will ever meet," which is renaming the nouns "Laura" and "David Hollis."