Final answer:
The link to move a potential consumer from interest to action is Communication feedback, involving a two-way interaction to adjust marketing strategies effectively.
Step-by-step explanation:
Once a marketer has a potential consumer's awareness, the necessary link to move them from interest to action is D) Communication feedback. This involves a two-way interaction between the marketer and the consumer, where the consumer's response to marketing messages is monitored and analyzed, allowing the marketer to adjust strategies and messages for better effectiveness. Sales promotions, brand loyalty, and integrated marketing are all important, but it is the communication feedback that actively engages the consumer and helps them make the transition from simply being interested in a product or service to taking action and making a purchase.