Final answer:
The correct format for citing a source in APA style is to include the author's name, publication date, title of the article in quotation marks, and the name of the publication in italics.
Step-by-step explanation:
Option c) ("Tourism in Greenland" - The Economist)
The correct format for citing a source in APA style is to include the author's name and the publication date in parentheses. The title of the article should be in quotation marks, followed by the name of the publication in italics. If the article is from a website, the URL should be included at the end.