Final answer:
The safety category metric in a WW Delivery Station scorecard is the Incident Rate, which measures the safety incidents relative to the number of hours worked.
Step-by-step explanation:
In the context of a WW Delivery Station scorecard, the metric that falls under the safety category is c) Incident Rate. Safety metrics typically refer to measures that represent the safety performance and environment of a workplace. Incident Rate is a key performance indicator that tracks the number of safety incidents that occur over a period, relative to the number of hours worked. A lower Incident Rate reflects a safer working environment, which is crucial for the well-being of employees and smooth operation of the delivery station.