Oligopolistic firms:

A$)$ would not drive competitors out of business to gain control of the market.

B$)$ know that their competitors pay no attention to their pricing decisions and therefore hope to gain market share by lowering price.

C$)$ may seek to drive competitors out of business for personal reasons, even at great expense.

D$)$ do not pay attention to a competitor's prices because there's nothing they can do about them.