Correct answer choice is :
B) Raw materials.
Step-by-step explanation:
A raw material, also recognized as a feedstock or most accurately unprocessed material, is a primary material that is used to produce goods, finished products, energy, or common materials which are feedstock for future complete products. Raw materials index is the total cost of all segment parts currently in stock that have not yet been used in work-in-process or doomed goods production.