With Regard to a Product for Which a Promotional Mix

With regard to a product for which a promotional mix is being developed, complexity:

A) refers to the degree of service or support required after the sale.
B) can be assessed in terms of financial risk, social risk, and physical risk.
C) in a product means that there should be less emphasis on personal selling.
D) refers to the technical sophistication of the product and hence the amount of understanding required to use it.