Which scientific term best matches this description: Small ice-rich body, typically less than about 12 miles (20 kilometers) across, that travels around the Sun, often in highly eccentric orbits?

A) Kuiper Belt (object)

B) main asteroid belt

C) moon

D) comet

Answer: D

Explanation: A small ice-rich body, typically less than about 12 miles (20 kilometers) across, that travels around the Sun, often in highly eccentric orbits. The solid body is also called the comet's nucleus.