Answer:
D. A "customer" work center signals to the "supplier" workstation that more parts are needed.
Step-by-step explanation:
The Kanban system or procedure is based in signals that travel with the product all over its production process from the start up to the final client.
When a "customer work center" takes away some material from the warehouse, the "kanban" or signal travels with the material. So this is a "pull" system guided by the demand.
The signal (kanban) is how the client let the supply work center know that a new material is needed in the warehouse.
For all of this, de correct answer is D.A "customer" work center signals to the "supplier" workstation that more parts are needed.