Which quantity and unit are incorrectly paired?
a. quantity: f unit: kg m/s
b. quantity: j unit: n·s
c. quantity: w unit: j
d. quantity: p unit: w
e. quantity: e unit: kg m2/s2

Force, the unit is Newton, newton is the force to accelerate a mass. so it should be kg m/s^2

joule (J) is equal to Nm not Ns

the unit of work is J and it is correct.
the unit of power is J/s which is equal to W
the unit of of energy is the same with work, which is J which equivalent to kgm2/s2

Ithink it is letter b, i may be wrong but i think that is the answer