Answer: In regards with niche strategy the following statement is true: Companies that adopt a niche strategy have only a small number of customers.
Niche is a term that stands for commodities, services, or inclination that charms a small, differentiated part of the demography.
Therefore, if an organization chooses to adopt niche strategy then they are targeting a small and differentiated part of the consumer database or population.
Therefore, the correct option in this case is (d)