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Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as: Assertion (A): The resistivity of a semiconductor increases with temperature. Reason (R): The atoms of a semiconductor vibrate with larger amplitude at higher temperatures thereby increasing its resistivity.

A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)        

B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)

C) Assertion (A) is true but Reason (R) is false             

D) Assertion (A) is false and Reason (R) is also false