Which of the following could be units of acceleration?

Question

A) mi/h
B) m/s
C) mph
D) m/s/s
I know acceleration is the velocity/Time so I think they are all units of acceleration. Is this right?

Answer 1

acceleration is change of velocty per time, or (m/s)/s= m/s^2= m/s/s

Answer 2

Thank you