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The purchasing department and the marketing department have some of the responsibility, but they are not the only departments that are responsible for the variance.
The purchasing department has some responsibility, but it is not the only department that is responsible for the variance.
The marketing department and the production department have some of the responsibility, but they are not the only departments that are responsible for the variance.
Purchasing, marketing and production all have some responsibility for the variance. The purchasing department is responsible for misplacing the paperwork and not ordering the raw materials in a timely manner, necessitating the search for a new supplier. The marketing department is responsible because they accepted a rush order for a nonstock item without checking first with the production department about whether it was feasible to fulfill the order under the terms the customer required. The production department supervisor is responsible for rushing the raw materials received into production without inspecting them first.