The answer is b
Hope this will help.
Answer: meters per second
Explanation:
Speed is simply referred to as the distance that is traveled by someone or a particular thing per unit of time. Speed has to do with how fast a particular object can be.
Speed is considered to be a scalar quantity and its s.i unit is then meters per second.
I really don't know the answer, I just don't know what language you're using, I'm so sorry