Which of the following is a proper unit of accerlation

Like so many others in math and science,

this question raises many other questions.

A few of them are:

- - What does "the following" mean?

- - What does "accerlation" mean?

and

- - What are the answer choices?

==> (any unit of length) divided by (any unit of time x any unit of time)

is a unit of acceleration.

==> (any unit of speed) divided by (any unit of time)

is also a unit of acceleration.