If a person views three lights that differ only in amplitude,what would the person perceive about the lights

A)  They are different shades of the same colour. 
B)  They differ in colour. 
C)  They differ in brightness. 
D)  They differ in saturation.

Amplitude

In physics, amplitude refers to the maximum distance moved by a point or object from its equilibrium position in a periodic motion, such as in waves or vibrations.

Perceive

To become aware of, know, or identify by means of the senses.

Brightness

A perceptual attribute of light sources and colors that enables an observer to judge their intensity or illumination.