The communication capabilities of internet-enabled technologies take three forms: (1 marketer-to-consumer e-mail notification; (2 ; and (3 consumer-to-consumer chat rooms, instant messaging, and social networking website

Marketer to marketer

Explanation:

Honestly its the last one that makes sense. You already have Marketer to consumer and consumer to consumer, therfore using the process of elimination it shows that the last answer has to be marketer to marketer.

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C) to abolish the practice of slavery within the United States.