Which of the following theories can be adopted to rectify the drawbacks of classical theory?

Which of the following theories can be adopted to rectify the drawbacks of classical theory? Correct Answer Quantum theory

In classical theory, the properties of metals, such as electrical and thermal conductivities are well explained on the assumption that the electrons in the metal freely moves like the particles of a gas. Hence it can be used to rectify the drawbacks of classical theory.
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Related Questions

In displacement-based plate theories, which assumption of Classical Plate Theory is relaxed in Shear Deformation Theory?
Assertion (A): The assumptions of Theory Y are diametrically opposite to those of Theory X.
Reason (R): Theory X reflects behavioural approach while theory Y reflects classical approach.