Which of the following statements is/are correct? I. Pure Si doped with trivalent impurities gives a p-type semiconductor II. Majority carriers in a n-type semiconductor are holes III. Minority carriers in a p-type semiconductor are electrons IV. The resistance of intrinsic semiconductor decreases with increase of temperature

• A. I only                    
• B.        I, III and IV
• C. I and IV                
• D.        II only