Oligopolists Have More Control Over Prices Than Monopolistic Competitors Because

Oligopolists have more control over prices than monopolistic competitors because

A) they can legally collude whereas monopolistic competitors may not.
B) their prices are always set by the government.
C) with fewer competitors,they are able to monitor and determine their own prices much easier.
D) since an oligopolist is the only competitor in the market,setting prices is no problem.