Final answer:
Human resource management is a key method for improving efficiency in internal operations, along with the adoption of technology and focusing on core competencies.
Step-by-step explanation:
Improving the efficiency of internal operations is a key aspect that businesses aim to optimize to maximize their performance and profitability. Among the options provided, human resource management is a suggested method for improving the efficiency of internal operations. Effective human resource management ensures that the right employees are in the right positions, are well-trained, and are properly motivated, which is essential for a productive and efficient workforce. Additionally, incorporating technology into operations can enhance resource utilization and support a larger customer base. Lastly, focusing on a company's core competency often results in a more successful business outcome, as specialization can lead to greater efficiency and expertise in that area.