The correct answer is: "the main danger for consumers consists on more expensive and lower quality products being offered"
The corporate trend consisted on the proliferation of large-size firms with strong market power, that many times were able to expel competitors from the market and ended up operating in the market alone.
When a company operates in a market as the only producer (monopoly) has market power to fix a higher price and to not care too much about the quality of its products, as consumers do not have a different supplier from whom they could purchase the product instead.