Answer: The correct answer is "c. complexity".
Explanation: In the context of the product characteristics that can be used to predict and explain the rate of acceptance and diffusion, the degree of difficulty involved in understanding and using a new product is known as complexity.
For example, a product is "complex" when the buyer does not understand or is not able to use it by his own means, and in that case he must receive instructions from the sellers.
The more difficult its use, the greater the degree of complexity of the product.
