Final answer:
Price and affordability are key characteristics that influence the rate of adoption of a product. Affordably priced products tend to have higher adoption rates among consumers who feel able to purchase them. Intangible aspects of product differentiation can also influence consumer demand and adoption rates.
Step-by-step explanation:
The question asks which product characteristic influences the rate of adoption of a product and how it affects that rate. Among the options provided, B. Price and affordability, which affect consumer budgets is a characteristic that has a significant influence on the rate of adoption. When a product is priced affordably, more consumers are likely to purchase it, thereby increasing its adoption rate. This is linked to the concept that ability to purchase suggests that income is important -- if consumers feel they can afford the product, they will be more willing to buy it.
Other factors also play a role in product differentiation and influence consumer demand. Intangible aspects such as guarantees of satisfaction, a reputation for high quality, free delivery services, or loans to purchase the product can differentiate a product and influence the demand for it. These aspects can create strong brand loyalty among consumers, which can also affect the rate at which a product is adopted in the market.