Answer:
The correct answer is the option B: their switching costs are low.
Step-by-step explanation:
To begin with, the term known as market power, in the business world, refers to the ability that the customers have in order to make a great change in the market regarding quantity demanded or price of the product even. Moreover, this type of power is due to certain characteristics in some markets.
To continue, in the case presented above, the buyers have higher market power when their switching costs are low due to the fact that the customers find the price of the products among the companies very similar although the products might be different. And therefore that switching among the companies do not represent a high cost for the customers, given them high market power.