What size of coffee is not regular brewed but rather decaffeinated?

The choice of decaf coffee is the only option that specifically indicates a type of coffee that is not regular brewed. Decaffeinated coffee is made from coffee beans that have had most of their caffeine removed, distinguishing it from regular coffee. This makes it particularly appealing to those who want to enjoy the flavor of coffee without the stimulating effects of caffeine.

In contrast, the other options do not pertain to the brewing process of coffee. Regular brewed coffee is typically larger in size but does not specify anything related to decaffeination. The options of milk and Simply Orange Juice are beverages but are not coffee products at all, thus they cannot be decaffeinated or classified in terms of regular or decaffeinated brewing processes. Therefore, "decaf coffee" directly addresses the question regarding the characteristic of being non-caffeinated while related to coffee, making it the correct answer.