Answer:
The correct answer is B. ("the smartest underwater mammal").
Explanation:
When a socurce has and unknown author, you have to use the title instead, in this case the title of this article is "The smartes underwater mammal" and as it is not long, you title in "quotation marks", in the case it was longer then you should have done it in italics, and provide the page number if available, if not this is how the parenthetical citation would look for this article with no author and page: parenthesis, quotation marks, name of the article, quotation marks and parentheris again.
