A 3-phase induction motor has full load efficiency of 0.7 and a maximum efficiency of 0.85. It is operated at a slip of 0.6 by reduced voltage method. The efficiency of the motor at this operating point is

• A. less than 0.35
• B. greater than 0.35
• C. in the range of 0.8 to 0.2
• D. none of the mentioned