Your answer is A. racers, because racers is direct.
If this is MLA format, in-text citations only require the author and the page number. if no author exists, then you provide the title and the page number. if there is no author and no page number, you simply give the title.
assuming the author is starks, the page is 97, and the title is "animals"--you only have to put (Starks 97) in parentheses. the author and the page is enough information for someone to access your source.
Sentence b does not use an adverb clause
