Which of the following statement is true?

Options

A. Some complex metal oxides behave as superconductor
B. Zinc oxide can act as superconductor
C. An impurity of tetravalent germanium in trivalent gallium creates electron deficiency
D. A Frenkel defect is formed when an ion is displaced from its lattice site to an interstitial site

Explanation

Frenkel defect is formed by displacement of ion from its lattice site to interstitial state .