The correct answer is: A. Fall in value of asset
Depreciation is the decrease in the value of an asset over time. It is caused by a number of factors, including wear and tear, obsolescence, and changes in market value. Depreciation is an important concept in accounting, as it allows businesses to account for the decline in the value of their assets over time.
Option B is incorrect because decrease in usefulness is not the only factor that causes depreciation. Other factors, such as wear and tear, obsolescence, and changes in market value, can also cause depreciation.
Option C is incorrect because decrease in the obsolescence of the asset is not a factor that causes depreciation. Obsolescence is a factor that can cause a decrease in the value of an asset, but it is not a factor that causes depreciation.
Option D is incorrect because decrease in asset due to wear and tear is a factor that causes depreciation. Wear and tear is a natural process that causes assets to decline in value over time.
