Question

a form of matter with indefinite shape and volume
molecule
atom
thermal energy
gas

Explanation:

In the states of matter, gas has an indefinite shape and volume. A molecule is a group of atoms, an atom is the basic unit of matter, and thermal energy is related to heat, not a form of matter with indefinite shape/volume. So the correct answer is Gas (the fourth option, assuming the options are ordered as Molecule, Atom, Thermal Energy, Gas).

Answer:

D. Gas