Answer:
B) Focusing on a more narrowly defined segment and "outfocusing" the focuser.
Step-by-step explanation:
Ikea is a cost leader, but it also focuses on offering differentiated features that appeal to its target market (young buyers interested in stylish furniture at low cost), like unique designs, extended hours, playrooms for customers' children, etc.
So if another firm wants to beat Ikea at its own game, it must offer similar but better services and products by focusing on Ikea's strengths and beating them on their own game.