Answer:
C. Solid, gas.
Explanation:
Matters are classified according to their states- solid, liquid, or gas. And accordingly, their compositions also differ.
Solids are those substances that can form a definite shape and has a definite volume.
Liquids, on the other hand, can have a definite volume but not a definite shape.
Gases do not have any definite form nor volume.
Thus, the final sentence will be-
A solid has a definite shape and definite volume while a gas does not have a definite shape and does not have a definite volume.
