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) refers to the technical sophistication of the product and hence the amount of understanding required to use it.
D) in a product means that there should be less emphasis on personal selling.