Answer:
D. Strategic focus
Step-by-step explanation:
Strategic focus or focus strategy is is when a company concentrates its resources in a narrowly defined part of the market (market segment). It allows businesses compete on basis of low cost, differentiation and rapid response against much larger businesses which also in turn has larger resources.
It's usually employed where the company or the firm knows the segment of the market and has products to competitively satisfy it's needs focusing on that narrow aspect of the market to build a strong competitive advantage.