Final answer:
The tactic that should be followed in the SEO program for Starbucks is to build the site's authority by garnering more mentions on nonaffiliated websites.
Step-by-step explanation:
The tactic that should be followed in the SEO program for Starbucks is option E: Build the site’s authority by determining ways to garner more mentions on other, nonaffiliated websites.
This tactic focuses on increasing the website's authority by earning mentions from other websites.
This can be achieved through creating valuable content, building backlinks, and engaging in influencer marketing, among other strategies.
By implementing this tactic, Starbucks' website will gain more visibility in organic search results and attract more users to their web pages promoting and selling their at-home coffee-brewing systems.