Neglecting resistance, at constant flux density, the power required per kilogram to magnetize the iron core of a transformer is 0.8 W at 25 Hz and 2.04 W at 60 Hz. The power required per kilogram for 100 Hz is

• A. 3.63 W
• B. 3.8 W
• C. 5.2 W
• D. 3.4 W