Answer:
d. broadly; lowers
Step-by-step explanation:
An antitrust lawsuit can be defined as the way in which suit are been filed under federal or state antitrust laws in which the lawsuit can either be brought by a company's competitors for anticompetitive business practices or by purchasers of a product or service.
Antitrust laws can also be seen as a form of regulations that help to monitor the distribution of economic power in business by making sure that competition that are healthy are been allowed to flourish so that the economies can grow which is why Antitrust laws are often apply to nearly all industries and sectors.
Therefore A firm defending itself in an antitrust suit would prefer the market it operates in to be defined BROADLY which LOWERS the firm's market share compared to what it might be judged otherwise