The correct answer is C: Electric force. Electric force is a force interacting between static electrically charged particles and it is defined by Coulomb's law: F=k*q1*q2/r² F is the force k is Coulomb's constant q1 and q2 are two charged particles r is the distance between q1 and q2 F can be negative if the force between the charges is attractive (the charges have opposite signs) or F can be positive if the force between charges is repulsive (the same signed charges).
