Credit Card

C

The correct answer is C. Plastic.

Credit cards are commonly referred to as "plastic" because they are made of plastic material and have a flat, rectangular shape similar to that of a small piece of plastic. This informal term is often used interchangeably with the more formal term "credit card."

Option A, ATM, refers to an automated teller machine, which is a computerized machine used by banking customers to perform transactions, such as withdrawing cash, checking account balances, and transferring funds between accounts.

Option B, Discount card, refers to a card that offers discounts on purchases from specific retailers or merchants. These cards are often issued by stores or credit card companies and can provide a percentage off the purchase price, free shipping, or other benefits.

Option D, Play money, refers to fake or toy money that is used for playing games or as a teaching tool for children. It has no real value and cannot be used to purchase goods or services.