Answer:
d. Expense
Step-by-step explanation:
Cost of goods sold is the cost which is incurred by the firm on the number of units it has sold. Since it is the cost which is used to produce the number of units a firm has sold, thus it is in the nature of expense.
Cost of goods sold is reported as an expense in the financial statements.
Option a and b are not true because it is an expense in nature thus cannot be accredited as assets of any type.
Option c is also not true as a firm has spent this cost on making goods it has sold, which means it cannot be a liability.