Answer:
O Focused differentiation, but not cost leadership
Step-by-step explanation:
A focused differentiation strategy is based on serving specific markets or niches. They offer differentiated products that are valued and looked for by specific type of customers. In this case, Boehm's customers are sophisticated collectors, they are not just average ordinary customers. Their customers know about sculptures and they look for certain types of products. That is why they can be considered a niche.
A cost leadership strategy would involve trying to sell their products at a low cost and that does not apply to artists that are trying to establish their brand. Mr. Boehm's sculptures are not cheap and probably will never be.