Question

Select all that apply.

Answer 1

$\text{Acceleration}=\frac{d^2}{dt^2}\text{displacement}$
So the dimensions of acceleration is $LT^{-2}$
Any answer that comes under that definition is correct.

Answer 2

Strange as it may seem, four of those five choices 
are perfectly good units of acceleration.

The only one that isn't is the one in the middle:  ft/s