The correct answer is A. Expense.
An expense is a decrease in assets or an increase in liabilities that results from the sale of goods or services, or from the normal operation of a business. Expenses are recorded in nominal accounts, which are temporary accounts that are used to track revenues and expenses for a specific period of time. At the end of the accounting period, the balances of the nominal accounts are closed to retained earnings.
Profit is the difference between revenues and expenses for a specific period of time. Profit is recorded in a nominal account, but it is not a type of expense.
Assets are resources that a business owns and expects to benefit from in the future. Assets are recorded in real accounts, which are permanent accounts that are used to track the assets of a business over time.
Liabilities are obligations that a business owes to others. Liabilities are recorded in real accounts, and they are settled over time.
In conclusion, the correct answer is A. Expense.