When Consumers Decide to Purchase a Music CD from Amazon

When consumers decide to purchase a music CD from Amazon.com,the company's website often suggests that consumers purchase an additional CD by the same artist for a combined price that is lower than the two CDs would sell for separately.Amazon.com is using

A) product-bundle pricing.
B) complementary product pricing.
C) full-line pricing.
D) bid pricing.
E) demand-backward pricing.