What is the …… for an air letter? A. fare B. value C. postage D. stamp

The correct answer is C. postage.

Postage is a fee charged for the delivery of mail. It is usually paid by the sender of the mail, and is used to cover the cost of transporting the mail and providing other services such as sorting and delivery.

The other options are incorrect because:

• Fare is the price paid for transportation, such as on a plane or train.
• Value is the worth of something, such as the monetary value of an item.
• Stamp is a small piece of paper that is affixed to mail to indicate that postage has been paid.