What Are the Key Activities Required to Facilitate the Flow

What are the key activities required to facilitate the flow of a product from point of origin to point of consumption?

A) Purchasing, producing, allocating, storing, and retailing,
B) Demand forecasting, managing the movement of raw materials into an organization, processing of raw materials into finished goods, and movement of finished goods toward the end customer.
C) Customer service, demand forecasting, inventory management, storing and retailing, and material handling.
D) Customer service, demand forecasting, inventory management, logistics, and material handling.