When Karen went to Amazon.com, based on her past purchases, the site asked her if she was interested in a new book by Deepak Chopra. It also asked her if she wanted to be reminded when new books by Chopra or authors of similar books became available. Karen was even able to review her past purchases. All of these unique customer services enable Amazon.com to:
A. differentiate itself from other retailers of books.
B. combat the problems associated with service intangibility.
C. prevent price comparisons with other electronic retailers of books.