What is the warehouse activity that involves retrieving materials from storage and bringing them to manufacturing to fulfill a production order, or retrieving finishing goods from storage and preparing them for shipment to fulfill a customer order?

 Picking

Explanation:

              A ware house is a place where raw materials or finished goods are kept for further processing. From the ware house the raw materials are sent back top the manufacturing unit for production of the final product. Or the finished goods are sent for delivery to fulfill the customer order.

               Thus picking is a process in supply chain management where the materials are retrieve from the ware house and sent to the production unit for production or the finished goods are retrieved from the ware house and prepare them for shipping to the customer.

Thus the answer is picking.

i honestly speaking this is too long