Answer: D. After satisfying the demand for early adopters, firms lower price to attract the more price sensitive consumers.
Step-by-step explanation:
Based on the scenario given in the question, the reason for the fall in price over time is that after satisfying the demand for early adopters, firms lower price to attract the more price sensitive consumers.
The early adopters are the individuals who use the product before other people starts using it. In this case, once the early adopters have been satisfied, other people will want to buy the product and the price has to be lowered so that such people can afford it.