Here's why:

* PET is a strong, lightweight, and transparent plastic.

* It's relatively inexpensive to produce.

* It's resistant to chemicals and can withstand the pressure of carbonation.

* It's also recyclable, although the process for recycling PET bottles is becoming more complex due to the various types of PET used.

While Polycarbonate (PC) is another strong and transparent plastic, it's typically used for other applications like CDs, DVDs, and safety glasses. PC is generally too expensive and has a higher melting point than PET, making it less suitable for large-scale bottle production.

PE (Polyethylene) is also commonly used for plastic bottles, but it's more often used for water bottles or other non-carbonated beverages.

So, to answer your question directly, coke bottles are made from PET.