Which One of These Is a Correct Definition

Multiple Choice

Which one of these is a correct definition?

A) Net working capital equals current assets plus current liabilities.
B) Current liabilities are debts that must be repaid in 18 months or less.
C) Current assets are assets with short lives,such as accounts receivable.
D) Long-term debt is defined as a residual claim on a firm's assets.
E) Tangible assets are fixed assets such as patents.