Concept:Contango is the charge paid to postpone the settlement of a transaction on the stock exchange.
Explanation:On the stock exchange, a transaction must be settled by a specified date.
If a speculator or buyer cannot settle his account within that period, he can carry the transaction forward to the next settlement period.
The charge paid for this non-settlement and for the privilege of deferring payment is called contango.
In contrast, backwardation is a charge paid by a seller who fails to deliver shares on the settlement date.
Brokerage refers to the fee charged by a broker for executing a purchase or sale.
Commission is the service charge collected by an agent for arranging a transaction.
Among the given options, only contango matches the description of a charge for non-settlement of an account within the specified period.
Answer:D. contango