Final answer:
Business process reengineering focuses on restructuring business processes to improve organizational efficiency and effectiveness, especially by consolidating activities into a single group that is responsible and accountable. The correct option is B.
Step-by-step explanation:
Business process reengineering is a tool for pulling the pieces of strategy-critical activities out of different departments and unifying their performance in a single department or cross-functional work group. This approach is designed to give a group charge over the entire process, enhancing accountability and aiming for the activity to be performed in a better, cheaper, and/or more strategy-supportive fashion.
While business process reengineering can indeed affect aspects such as core competencies, organizational size, product quality, customer service, and competitive capabilities, its focus is on the restructuring of business processes to improve efficiency and effectiveness.
Hence, Option B is correct.