The specific heat at constant volume for an ideal gas is given by cv = 0.7 + (2.7 × 10 -4)T (kJ/kg·K) where T is in kelvin. The change in the internal energy for this ideal gas undergoing a process in which the temperature changes from 27 to 127°C is most nearly
(a) 70 kJ/kg
(b) 72.1 kJ/kg
(c) 79.5 kJ/kg
(d) 82.1 kJ/kg
(e) 84.0 kJ/kg