11. For a semiconductor, the conductivity may increase as the temperature increases. What is the possible mechanism of this phenomenon?
(A) The electron drift velocity increases as the temperature increases.
(B) The ion drift velocity increases as the temperature increases.
(C) The defect number of its structure increases as the temperature increases.
(D) The ion vibration amplitude increases as the temperature increases.
(E) The free electron density increases as the temperature increases.

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