A) gas giant (Jovian planet)
B) ice giant
C) planetesimal
D) Kuiper Belt (object)
Answer: C
Explanation: A solid object arising from the accretion of other orbiting objects composed of rocks, dust, and ices via gravitational forces. Planetesimals correspond to objects larger than approximately 1 kilometer (0.6 miles) in circumstellar disks like the one from which the solar system's planets formed, and they are regarded as the building blocks of planets.