Final answer:
High compatibility with existing products is not a characteristic that would slow the rate of adoption of new products.
Lack of opportunity to try out the product, product complexity, and lack of relative advantage over substitute products can all have a slowing effect.
Step-by-step explanation:
The characteristic that would not slow the rate of adoption of new products is c. high compatibility with existing products.
High compatibility with existing products actually facilitates the adoption of new products, as it makes it easier for consumers to integrate the new product into their existing routines and systems.
On the other hand, lack of opportunity to try out the product, product complexity, and lack of relative advantage over substitute products can all slow down the rate of adoption by creating barriers and uncertainties for consumers.