+4,+3,+2 and +1 are valences have the greatest tendency to form ions.
Answer:
The magnets are placed side by side with the opposite poles of each magnet near the other (Option D/Option 4)
Explanation:
The two moved towards eachother when released, and that will only happen the opposite poles are facing eachother.
Sorry if this doesn't make much sense.
It would be c the sensory nervous system.
