Theoretically, a Firm Can Enter an Industry with Low Prices

Theoretically, a firm can enter an industry with low prices, drive out their competition and take advantage of their newly achieved monopoly power to raise prices, but the evidence is that Walmart has

A) tried to do this and failed for economic reasons.
B) tried to do this and failed for legal reasons.
C) succeeded at doing this.
D) never tried to do this.