Abuse of market dominant position refers to the behavior of operators who can control the price, quantity or other trading conditions of commodities in the relevant market, or can hinder and affect other operators to enter the relevant market, use their market dominant position to endanger competition and damage the public interests and other private interests of competitors and society.
According to the above definition, which of the followings constitutes an abuse of market dominance?
Factory A and B, with a market share of 70% of the lighter market in a certain city,  reached an agreement on limiting the production quantity and sales price, resulting in the bankruptcy of many small manufacturers, in order to alleviate the serious decline in sales due to the economic downturn.