In 2017, the Department of Justice Was Investigating Pharmaceutical Companies

In 2017, the Department of Justice was investigating pharmaceutical companies regarding the pricing of generic drugs.This is an example of attempts by the government

A) to prevent vertical mergers which would significantly reduce competition and raise prices.
B) to prevent horizontal mergers which would significantly reduce competition and raise prices.
C) to regulate a natural monopoly by establishing government-regulated prices.
D) to keep firms from colluding to raise prices.