Continuous improvement, often referred to as Kaizen, focuses on making small, incremental changes to processes with the goal of improving efficiency and quality. Here’s a breakdown of why option A is correct:

Never-ending effort to expose and eliminate root causes of problems: Continuous improvement is an ongoing process that seeks to identify and address the fundamental causes of inefficiencies and issues.

Management effort to reduce cycle time: While reducing cycle time is a component of continuous improvement, the primary focus is on identifying root causes.

Big-step improvements: Continuous improvement typically involves small, incremental changes rather than large, radical changes.

Supplier replenishment: This describes a vendor-managed inventory system, not the essence of continuous improvement. Thus, the best description of continuous improvement is a never-ending effort to expose and eliminate root causes of problems.

References

Imai, M. (1986). Kaizen: The Key to Japan's Competitive Success.

Liker, J. K. (2004). The Toyota Way: 14 Management Principles from the World's Greatest Manufacturer.