The correct answer is letter D. candela. The unit for measuring the rate at which light energy is radiated from a source is the candela. L<span>umen is the unit for measuring the total amount of visible light emitted by a source. Lux is lumen per square meter. </span>
Density =mass/volume
density= (0.044kg/(11 x10^-6)
4000kg/m^3
Am sorry what can you be more specific