Concept:
The Solar System contains, besides planets and their moons, many smaller bodies of different composition and shape.
Step 1:
Asteroids are small rocky and metallic bodies that orbit the Sun, mostly in the asteroid belt between Mars and Jupiter. Because they are too small for their gravity to pull them into a sphere, they remain irregular in shape.
Step 2:
Comets, by contrast, are made largely of ice and dust and develop tails, while stars are massive self-luminous gas bodies. Hence the rocky, irregularly shaped small objects are the asteroids.
Answer: Option (2) — Asteroids.