In which of the following market circumstances is a broad differentiation strategy generally not well-suited? a. when buyer needs and preferences are too diverse to be fully satisfied by a standardized product. b. when few rivals are pursuing a similar differentiation approach. c. when the products of rivals are weakly differentiated. d. when there are many ways to differentiate a product or a service and many buyers perceive these differences valuable. e. when technological change is fast-paced and competition revolves around rapidly evolving product features.