How can you pay for a money order?

The option stating you can pay for a money order using cash, debit card, or traveler's check is the correct choice because these payment methods are commonly accepted at most locations where money orders are sold, including USPS offices and other retail outlets.

Cash is a straightforward method that is widely accepted, providing the buyer with an immediate and tangible form of payment. A debit card is also a convenient option, allowing individuals to use their bank funds without the need for cash on hand. Traveler's checks offer a secure alternative, especially for those who may be wary of carrying cash.

In contrast, other payment methods mentioned in the incorrect options, such as checks or credit cards, may not be as universally accepted for money orders. Many retailers and postal services refrain from accepting personal checks due to the risk of insufficient funds or fraudulent checks. Similarly, credit cards may not be allowed since they involve a borrowing aspect which goes against the typical cash-based nature of money orders. Therefore, option B encompasses the most flexible and widely accepted payment methods.