Question

What does all matter have in common?
A.
It is all solid.
B.
It is too small to see.
C.
It is made up of molecules.
D.
It is made up of atoms.

Answer 1

D. It is made up of atoms.

All ordinary matter is composed of atoms (which in turn contain protons, neutrons and electrons). Not all matter is solid, not all matter is too small to see, and not all matter exists as molecules (some substances are atomic or ionic rather than molecular).