Which of the following assets is subject to depreciation?

Tangible assets are subject to depreciation because they have a physical form and a finite useful life. Depreciation is the accounting method used to allocate the cost of tangible fixed assets over their useful lives, reflecting the wear and tear that occurs as the asset is used in business operations. This process helps ensure that financial statements accurately represent the value of assets and the expenses associated with their usage, ultimately providing a clearer picture of a company's financial health.

In comparison, natural resources have a different accounting treatment called depletion, which is used to allocate the cost of extracting natural resources over their usable life. Intangible assets, on the other hand, are amortized, not depreciated, as they do not have a physical form. Financial investments are typically recorded at fair value and do not depreciate in the same manner as tangible fixed assets, because their value can fluctuate based on market conditions. Thus, tangible assets are the correct choice when identifying assets that are subject to depreciation.