Televised pet food commercials
, is the correct answer.
Information sources are those sources that provide us with some essential information in a particular subject. The source of information may include person, place, thing or any other means through which information can be obtained. Accordingly, in the given case option C, will not follow because it "Televised pet food advertisements" are sponsored by companies and those companies in order to increase their sell can prove their product as the best even though it is not of superior quality.
