Which automation tool in Pardot should be used?

LenoxSoft has a Product Interest form where prospects can select a field value for which product lines they are interested in. The company wants that form field to automatically add prospects to a list for the product line they are interested in. If they select "Product Line A," it will add them to the "Product Line A" list. If the prospect field value doesn’t contain "Product Line A," they would also like them to be removed from the list.

Which automation tool in Pardot should be used?
A . Dynamic list
B. Completion action
C. Automation rule
D. Segmentation rule

Answer: A