Final answer:
The correct MLA parenthetical reference for a magazine article when the author has multiple works listed is (Scott, "Pollution" 52), including the author's last name, a shortened title of the article, and the page number.
Step-by-step explanation:
When citing a magazine article in MLA format, and the author has multiple works listed, you need to differentiate between the works. According to the guidelines provided by the MLA, if an author has more than one work in the Works Cited list, use a shortened title of the work to clarify which work you are referencing. Therefore, the correct parenthetical reference for a magazine article when the author has two articles with different titles listed under Works Cited is:
(Scott, "Pollution" 52)
This citation includes the author's last name, a shortened version of the article title in quotation marks, because it is a shorter work within a larger publication, and the page number where the information you are citing can be found. This format helps the reader locate the specific article you are referencing in the Works Cited list.