Final answer:
Pluto is the largest body and nicknamed the 'King' of the Kuiper Belt, which is a region of icy objects extending from the orbit of Neptune to the outer edge of the Solar System.
Step-by-step explanation:
The largest body of the Kuiper Belt, extending from the orbit of Neptune to the distant outer edge of the Solar System, is Pluto. It is nicknamed the "King" of the Kuiper Belt and is also considered a dwarf planet. The Kuiper Belt is a region of icy objects beyond Neptune and is estimated to consist of as many as 100,000 objects.