A sender can cancel a one-time remittance transfer for up to ________ after he or she pays for the transaction.

The correct answer indicates that a sender can cancel a one-time remittance transfer for up to 30 minutes after the transaction is paid for. This timeframe is established to enhance consumer protection in the remittance market, allowing senders to have a short window to recognize if they need to reverse a transaction due to errors or changes in circumstances soon after sending funds.

Remittance transfers often involve significant amounts of money sent across borders, and the short cancellation period ensures that senders have an opportunity to act quickly, while still allowing the receiving institutions to manage their transaction processes efficiently. Additionally, it reflects the urgency associated with these transactions, where timing can be critical for both sender and recipient.

The other options suggest longer cancellation times that exceed the standard established by regulations surrounding remittance transfers, which generally allow only a brief moment after payment confirmation for a sender to cancel their transaction effectively.