Which of the following refers to the roundhouse kick?

The roundhouse kick is referred to as "Dolryeo Cha Ki" in martial arts terminology. This term specifically describes a kicking technique where the leg is swung in a circular motion to strike an opponent, typically targeting the side of the body or the head. The mechanics of the roundhouse kick involve pivoting on the supporting foot while the kicking leg arcs around, delivering power through the hip and the foot.

Other terms listed, while related to Taekwondo, refer to different techniques. "Dwi Joomuck" translates to a back fist strike, "Pal Ggup Pyo Jeok Chi Ki" refers to side fist strikes, and "Me Joomuck Naeryo Chi Ki" relates to a downward fist strike. Each of these techniques focuses on distinct strike types and methods rather than the circular motion and mechanics embodied in the roundhouse kick. Understanding this distinction is crucial for effective execution and application of the various techniques in martial arts practice.