The correct choice is (b) 0.4 kN/m^2
Best explanation: As per IS 875, the minimum imposed load on roof truss should be 0.4 kN/m^2. For sloping roof upto 10˚, the imposed load is taken as 0.5 kN/m^2 if access is not provided and 0.75 kN/m^2 if access is provided.