Final answer:
The sentence that correctly uses APA style for citation without an attributive phrase is "Young people were most likely to be injured while talking on their cell phones rather than texting (Nasar, 2013)."
Step-by-step explanation:
The correct sentence that uses the proper APA style for an in-text citation without an attributive phrase is: "Young people were most likely to be injured while talking on their cell phones rather than texting (Nasar, 2013)." In APA style, in-text citations should include the author's last name and the year of publication, separated by a comma, without any additional punctuation such as a colon or page numbers unless a specific part of the source is being quoted or referred to. In APA style, when citing a source with one author in the text, the author's last name and the year of publication should be included in parentheses. The page number is only required for direct quotations.