Why a business should record depreciation in the annual account?

Why a business should record depreciation in the annual account?
Depreciation distributes the cost of using a long term asset over the life of that asset. For example if you use a truck as part of your business that costs 100,000 US$ and has a life of 10 years, you have a few choices.
a) Charge the entire 100,000 in the first year, understate income in the first year and over state it in the remaining 9 years the truck get used.

b) Charge the 100,000 divided by the life of the truck (10 years) = 10,000 every year the truck get used and allow for a more fair distribution.

c) Charge the 100,000 divided by the schedule allowed in the tax code to get a tax break by charging off the asset more quickly than real life.


Not using it would understate business expenses and overstate income as illustrated above