Correct Answer - Option 3 : 2440 kJ/kg

__Concept:__

The total heat supplied will be comprised of heat supplied up to saturated water state and then latent heat.

Total heat will be Q = C_{P} ΔT + x h_{fg}

__Calculation:__

Given C_{P} = 4 kJ/kg K; ΔT = 100 - 30 = 70°C, x = 0.9, h_{fg} = 2400 kJ/kg

Q = 4 × 70 + 0.9 × 2400 = 2440 kJ/kg