All of the following statements about electromagnetic force are true except

a. it is one of the four fundamental forces in universe
b. it exerts a force on either charged or uncharged particles
c. it obeys the inverse-square law
d. it is produced by - and produces - electric and magnetic fields

(b) is the answer they want.
Electromagnetic force operates on charged particles only.
On the other hand, electromagnetic waves can exert a pressure on an uncharged body,
so (b) isn't ENTIRELY false...but the others are definitely true.