Answer:
two negative objects
two positive objects
a negative object and a positive object
Explanation:
The electric force is the force exerted by two charged objects. This means that this force can exist only if both objects have a non-zero charge: so, both object must be charged. This statement rules out all the options where there is at least one neutral object, since the electric force does not act on neutral object: therefore, the only possible options are
two negative objects
two positive objects
a negative object and a positive object
