The example of a substance which is NOT a medium is:
D. metal
What is a Medium?
It is any material substance which can propagate waves or energy.
Water is the mode of sea waves. Air is the medium through which we hear sound waves. The E.F andM.F are the vehicle of light. Individuals are the vehicle of an arena wave.
Metals are not considered as medium as they do not allow any energy to travel through them.
Thus, option D is correct.
Find more information about Metals here:
brainly.com/question/4701542
