What is the unit for impulse?
a. kg-n
b. kg-m/s2
c. n-s
d. j

"Impulse" is  (force applied) x (time that the force lasts) .

     [Force] x [time] units are  [Newton] x [second] .

If you go a little farther, it turns out that 'impulse' directly
produces a change in momentum, so it should have the
same units as momentum ... [mass] x [speed] .

In fact, it does !   But I doubt that you want me to go into that
right now, since you really didn't ask about it.  So you'll just
have to take my word for it:  Impulse and momentum both have
the same units.