Answer:
c. "The Walrus Man went over for lunch" (Smith, 1998, p. 31).
Explanation:
The proper way to cite a quotation from a book with APA style is by including the last name of the author and year of publication. For direct quotations, the page number is included.
Since there is a direct quote from the book, the quotation marks are necessary, and the page number is also essential.