Select the statement that correctly describes how light travels. (1 point) light travels at different speeds when the light source is moving and cannot travel in a vacuum. light cannot travel through a vacuum and travels slower when the light source is moving away. light can travel in a vacuum, and the speed at which it travels changes if the source is moving. light travels at a constant speed through a vacuum, even if the light source is moving.

Light travels at a constant speed through a vacuum, even if the light source is moving.          

Explanation:

Light is an electromagnetic wave. It can travel in vacuum. Maximum speed is the speed of light in vacuum = 3 ×10⁸ m/s

The speed of light does not change if the source is moving but its apparent frequency and wavelength may change.

The speed of light changes with the change in medium. It decreases in denser medium.

their crystal patterns have been disrupted by stress

i would say