<span> Light waves are a wave in the electromagnetic field, this field may exist in a vacuum. Sound needs either solid, liquid, or gas to propagate and therefore it is called a mechanical wave. Sound is a form of energy which is transferred by vibrating air molecules if motions of propagation is air.</span>
I think that's right like this
B ............ is the answer,
Answer:
strength and vitality required for sustained physical or mental activity
Explanation:
