Promotional tools fulfill various functions for an organization:

• Promotion can inform and make potential customers aware of an organization’s offering. They can also provide knowledge and understanding about a brand.
• Promotional tools influence and persuade the consumers.
• Promotional tools attempt to persuade current and potential customers of the desirability of entering into an exchange relationship.
• Elements of the promotion mix may be used to reinforce experiences. For example, it may remind people of a need they might have.
• Promotion makes it possible to provide reassurance or comfort immediately prior to an exchange or, more commonly, post-purchase.
• Promotion helps to differentiate a brand.

The correct option is D.