How can this requirement be met using a workflow email?

The shipping department at Universal Containers is responsible for sending product samples as part of the sales process. When an opportunity moves to the “sampling” stage, Universal Containers wants an automatic email sent to the shipping department listing the products on the opportunity.

How can this requirement be met using a workflow email?
A . Create it on the opportunity using a Visualforce email template.
B . Create it on the opportunity product using a Visualforce email template.
C . Create it on the opportunity product using an HTML email template.
D . Create it on the opportunity using an HTML email template.

Answer: A