**Core Concept**
The Critical Path Method (CPM) is a project management technique used to identify the longest sequence of dependent activities in a project, known as the critical path, which determines the minimum duration required to complete the project. It is widely used in health planning and management to optimize resource allocation and scheduling.

**Why the Correct Answer is Right**
The CPM method involves breaking down a project into its individual activities, estimating the duration of each activity, and then identifying the sequence of activities that determines the minimum project duration. This method helps managers to focus on the critical activities that require close monitoring and resource allocation to ensure timely completion of the project. The CPM method is particularly useful in health planning and management, where projects often involve multiple stakeholders, complex dependencies, and limited resources.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the Program Evaluation and Review Technique (PERT) is a different project management method that focuses on estimating the time required to complete each activity and then calculating the project duration based on the expected time. While PERT is also used in health planning and management, it is not the same as the Critical Path Method.
* **Option B:** This option is incorrect because the Gantt chart is a type of bar chart used to visualize the project schedule, but it does not provide the same level of detail as the Critical Path Method. Gantt charts are useful for high-level planning and communication, but they do not identify the critical path or provide detailed resource allocation information.
* **Option C:** This option is incorrect because the Work Breakdown Structure (WBS) is a hierarchical decomposition of the project scope into smaller, more manageable tasks, but it does not provide the same level of detail as the Critical Path Method. WBS is useful for planning and organizing the project scope, but it does not identify the critical path or provide detailed resource allocation information.

**Clinical Pearl / High-Yield Fact**
When using the Critical Path Method in health planning and management, it is essential to identify the critical path early in the project planning phase to ensure that resources are allocated effectively and that the project is completed on time.

**Correct Answer: C. The Critical Path Method (CPM) is a project management technique used to identify the longest sequence of dependent activities in a project, known as the critical path, which determines the minimum duration required to complete the project.**