Darren is giving a speech about the learning abilities of young children. During the speech, he says, "Children have an amazing capacity to learn. Christina Peralta, a writer for Sesame Street, puts it this way in Filmtastic's 2005 documentary Behind the Street: 'A four-year-old is like a sponge, soaking up everything around he sees and hears.'" Darren has

A. not established his source's credibility.
B. established the source's credibility by directly quoting the source.
C. established the source's credibility by mentioning the author's professional reputation.
D. established the source's credibility showing the source is affiliated with a trusted organization.

Answer: D