How much ice is filled in the cup for a drink?

The correct choice for how much ice should fill the cup for a drink is two-thirds. This amount ensures that there is enough ice to keep the drink cold without overwhelming it, allowing the beverage to maintain an optimal temperature. Filling the cup to two-thirds capacity with ice strikes a balance between providing a refreshing chill and ensuring customers can enjoy the full flavor and quantity of their drink.

Other options could either leave too little ice, not achieving the desired cold temperature, or fill the cup overly high with ice, which could limit the beverage volume. It's important to find that ideal ratio so that the drink is enjoyable for customers.