The quantity that describes the light giving radiant power of a luminaire in any particular direction is called ___________.

Correct option is D

Luminous intensity is a measure of power emitted by a light source in a particular direction per unit solid angle.

$$\text{It is given by: } I = \frac{\phi}{w} \text{ where,} \\I \text{ is Luminous intensity} \\\phi = \text{Luminous flux} \\w = \text{solid angle}$$​
SI unit of Luminous intensity is Candela.