The correct answer is: B. Bank balance
A postdated cheque is a cheque that is written on a date that is in the future. It is not considered as cash because it is not yet payable. The bank balance is the amount of money that is available in a bank account. It is considered as cash because it can be used to make payments.
Option A is incorrect because postdated cheques are not yet payable.
Option C is incorrect because postdated cheques are not receivables. Receivables are amounts that are owed to a company by its customers.
Option D is incorrect because postdated cheques are not cash reserves. Cash reserves are amounts of money that are held by a company for unexpected expenses.