Final answer:
Focused strategies keyed either to low cost or differentiation are especially appropriate for situations where the market is composed of different buyer groups, most other rival firms are using a best-cost producer strategy, or most industry participants are using a focused differentiation strategy.
Step-by-step explanation:
Focused strategies keyed either to low cost or differentiation are especially appropriate for situations where:
A. the market is composed of distinctly different buyer groups who have different needs or use the product in different ways.
B. most other rival firms are using a best-cost producer strategy.
E. most industry participants are also using a focused differentiation strategy.
In these situations, focused strategies can help the firm target specific buyer segments and differentiate itself from competitors, leading to a competitive advantage.