The source document for the data for debiting Work in Process for direct materials is a

A) purchase order
B) purchase requisition
C) materials requisition
D) receiving report

The materials requisition is the source document used to record the transfer of raw materials from the storeroom to the production floor. This document provides the details of the materials issued, the quantity, and the cost. It is used to debit Work in Process (WIP) for direct materials used in production. The purchase order and purchase requisition are used to order materials from suppliers, while the receiving report is used to record the receipt of materials.