Answer (A) is correct.
Off-balance-sheet debt includes any type of liability for which the
company is responsible but that does not appear on the balance sheet.
The most common example is the amount due in future years on
operating leases. Under U.S. GAAP, operating leases are not capitalized;
instead, only the periodic payments of rent are reported when actually
paid. Capital leases (those similar to a purchase) must be capitalized and
reported as liabilities.