Final answer:
Depreciation is an expense account that represents the allocation of an asset's cost over its useful life.
Step-by-step explanation:
Depreciation is an accounting method used to allocate the cost of an asset over its useful life. It is not a prepaid expense, but rather an expense that recognizes the reduction in value of an asset over time. Option a) is incorrect because depreciation expense is not a prepaid expense.
Depreciation is typically recorded as an expense on the income statement and as a contra-asset on the balance sheet. This means that it is not an asset account, as mentioned in option b).
Depreciation does not directly reflect a decline in an asset's market value. It reflects the allocation of an asset's cost over its useful life. While an asset may indeed decline in market value over time, depreciation is not a direct measure of that decline. Option c) is therefore false.
Based on the above explanations, the correct answer is option d) Depreciation is an expense account. It represents the systematic allocation of an asset's cost over its estimated useful life.