Intensity is
a. the lightness or darkness of a color.
b. the illumination coming from a light source.
c. the brightness or dullness of a color.
d. the color's name such as red, yellow, blue.

c on edg

Explanation:

the brightness or dullness of a color

c. the brightness or dullness of a color.

Explanation:

In color theory, lighter colors have a higher tonal value and reflect more light, while a lower value (brightness) color is darker and absorbs more light. Saturation or intensity: Refers to the vividness or paleness of a color, and is associated with its purity.