Answer:
(a) DM
(b) DL
(c) MO
(d) MO
Explanation:
(a) Frames and tires used in manufacturing bicycles.
This is cost directly related to the materials used in manufacturing a product and, thus, should be classified as a direct material cost (DM).
(b) Wages paid to production workers.
This cost is directly related to pay for the labor required to manufacture a product and, thus, should be classified as a direct labor cost (DL).
(c) Insurance on Factory equipment and machinery.
Although this is a cost incurred from manufacturing, it can't be directly linked to either materials or labor since it is an structural cost and, therefore, should be classified as a manufacturing overhead cost (MO).
(d) Depreciation on factory equipment
For the same reason as the previous item, this should be classified as a manufacturing overhead cost (MO).