The correct options are
A Shadows are created due to the absence of light.
C Shadows don't have any colour.
D Mirrors form a shadow when light is thrown on them.
Shadows are created due to the absence of light. Hence, they don't have any colour.
Shadows don't have point to point relationship with objects.
When light is thrown on the mirror, it reflects the light rather than letting light through it. Therefore, it forms a shadow behind it.